diff --git a/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-okhttp/infrastructure/ApiClient.kt.mustache b/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-okhttp/infrastructure/ApiClient.kt.mustache
index 39495761e5a99f06b8b63dfc909e52a8e5a44789..c3504b36f697e7f851c84b57969a897d7bed6939 100644
--- a/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-okhttp/infrastructure/ApiClient.kt.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-okhttp/infrastructure/ApiClient.kt.mustache
@@ -227,6 +227,7 @@ import com.squareup.moshi.adapter
         if (T::class.java == File::class.java) {
             // return tempfile
             {{^supportAndroidApiLevel25AndBelow}}
+            // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
             val f = java.nio.file.Files.createTempFile("tmp.{{packageName}}", null).toFile()
             {{/supportAndroidApiLevel25AndBelow}}
             {{#supportAndroidApiLevel25AndBelow}}
diff --git a/samples/client/petstore/kotlin-array-simple-string/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-array-simple-string/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index dc423d8a17dfb834258c8cc92fae495c64f5b636..f7ef39a50b30a15d7b00b94f5c172519e0c356c3 100644
--- a/samples/client/petstore/kotlin-array-simple-string/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-array-simple-string/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -129,6 +129,7 @@ open class ApiClient(val baseUrl: String) {
         }
         if (T::class.java == File::class.java) {
             // return tempfile
+            // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
             val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
             f.deleteOnExit()
             val out = BufferedWriter(FileWriter(f))
diff --git a/samples/client/petstore/kotlin-enum-default-value/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-enum-default-value/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index dc423d8a17dfb834258c8cc92fae495c64f5b636..f7ef39a50b30a15d7b00b94f5c172519e0c356c3 100644
--- a/samples/client/petstore/kotlin-enum-default-value/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-enum-default-value/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -129,6 +129,7 @@ open class ApiClient(val baseUrl: String) {
         }
         if (T::class.java == File::class.java) {
             // return tempfile
+            // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
             val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
             f.deleteOnExit()
             val out = BufferedWriter(FileWriter(f))
diff --git a/samples/client/petstore/kotlin-gson/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-gson/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index f25dd2bb9fa18a0cdc0b3f0addafd661b105c51e..3db7de855d64305b73ecfbb51c4fac0e6415acb5 100644
--- a/samples/client/petstore/kotlin-gson/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-gson/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -128,6 +128,7 @@ open class ApiClient(val baseUrl: String) {
         }
         if (T::class.java == File::class.java) {
             // return tempfile
+            // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
             val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
             f.deleteOnExit()
             val out = BufferedWriter(FileWriter(f))
diff --git a/samples/client/petstore/kotlin-jackson/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-jackson/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 2c33cebc9cbbadaf80a42165263e5384129870fd..2d88244449737a3f248b149e45123f4a4caa8ed8 100644
--- a/samples/client/petstore/kotlin-jackson/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-jackson/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -128,6 +128,7 @@ open class ApiClient(val baseUrl: String) {
         }
         if (T::class.java == File::class.java) {
             // return tempfile
+            // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
             val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
             f.deleteOnExit()
             val out = BufferedWriter(FileWriter(f))
diff --git a/samples/client/petstore/kotlin-jvm-okhttp4-coroutines/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-jvm-okhttp4-coroutines/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 8ed9955f644856109392b2d689a342ce56860215..3377fa7b5348029bc1df90ee296117883640179f 100644
--- a/samples/client/petstore/kotlin-jvm-okhttp4-coroutines/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-jvm-okhttp4-coroutines/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -131,6 +131,7 @@ open class ApiClient(val baseUrl: String) {
         }
         if (T::class.java == File::class.java) {
             // return tempfile
+            // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
             val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
             f.deleteOnExit()
             val out = BufferedWriter(FileWriter(f))
diff --git a/samples/client/petstore/kotlin-modelMutable/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-modelMutable/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 2abf02f23b4286668e47f348784c67e42773d74c..3868a5465d33bf46b645a862cc60b6ce930a0717 100644
--- a/samples/client/petstore/kotlin-modelMutable/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-modelMutable/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -129,6 +129,7 @@ open class ApiClient(val baseUrl: String) {
         }
         if (T::class.java == File::class.java) {
             // return tempfile
+            // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
             val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
             f.deleteOnExit()
             val out = BufferedWriter(FileWriter(f))
diff --git a/samples/client/petstore/kotlin-moshi-codegen/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-moshi-codegen/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 2abf02f23b4286668e47f348784c67e42773d74c..3868a5465d33bf46b645a862cc60b6ce930a0717 100644
--- a/samples/client/petstore/kotlin-moshi-codegen/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-moshi-codegen/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -129,6 +129,7 @@ open class ApiClient(val baseUrl: String) {
         }
         if (T::class.java == File::class.java) {
             // return tempfile
+            // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
             val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
             f.deleteOnExit()
             val out = BufferedWriter(FileWriter(f))
diff --git a/samples/client/petstore/kotlin-nonpublic/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-nonpublic/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 90c872b1e36ae0db6ecd71f8053e52768460a66f..40599b8784a8f33b65ef5619bef6080baf90a286 100644
--- a/samples/client/petstore/kotlin-nonpublic/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-nonpublic/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -129,6 +129,7 @@ internal open class ApiClient(val baseUrl: String) {
         }
         if (T::class.java == File::class.java) {
             // return tempfile
+            // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
             val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
             f.deleteOnExit()
             val out = BufferedWriter(FileWriter(f))
diff --git a/samples/client/petstore/kotlin-nullable/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-nullable/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 2abf02f23b4286668e47f348784c67e42773d74c..3868a5465d33bf46b645a862cc60b6ce930a0717 100644
--- a/samples/client/petstore/kotlin-nullable/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-nullable/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -129,6 +129,7 @@ open class ApiClient(val baseUrl: String) {
         }
         if (T::class.java == File::class.java) {
             // return tempfile
+            // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
             val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
             f.deleteOnExit()
             val out = BufferedWriter(FileWriter(f))
diff --git a/samples/client/petstore/kotlin-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 08053e0e04bca08f02078a31811f48743d7acacb..0f552c1eb8374af69cf463a6e16dc3b5070fc1b3 100644
--- a/samples/client/petstore/kotlin-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -126,6 +126,7 @@ open class ApiClient(val baseUrl: String) {
         }
         if (T::class.java == File::class.java) {
             // return tempfile
+            // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
             val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
             f.deleteOnExit()
             val out = BufferedWriter(FileWriter(f))
diff --git a/samples/client/petstore/kotlin-string/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-string/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 2abf02f23b4286668e47f348784c67e42773d74c..3868a5465d33bf46b645a862cc60b6ce930a0717 100644
--- a/samples/client/petstore/kotlin-string/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-string/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -129,6 +129,7 @@ open class ApiClient(val baseUrl: String) {
         }
         if (T::class.java == File::class.java) {
             // return tempfile
+            // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
             val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
             f.deleteOnExit()
             val out = BufferedWriter(FileWriter(f))
diff --git a/samples/client/petstore/kotlin-threetenbp/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-threetenbp/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 8467a2ab7da34d7b4273982d1dfef3189fdfdc8d..76937e094ad383ab770d9cc5fd6daf4bd9641826 100644
--- a/samples/client/petstore/kotlin-threetenbp/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-threetenbp/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -129,6 +129,7 @@ open class ApiClient(val baseUrl: String) {
         }
         if (T::class.java == File::class.java) {
             // return tempfile
+            // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
             val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
             f.deleteOnExit()
             val out = BufferedWriter(FileWriter(f))
diff --git a/samples/client/petstore/kotlin-uppercase-enum/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-uppercase-enum/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index dc423d8a17dfb834258c8cc92fae495c64f5b636..f7ef39a50b30a15d7b00b94f5c172519e0c356c3 100644
--- a/samples/client/petstore/kotlin-uppercase-enum/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-uppercase-enum/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -129,6 +129,7 @@ open class ApiClient(val baseUrl: String) {
         }
         if (T::class.java == File::class.java) {
             // return tempfile
+            // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
             val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
             f.deleteOnExit()
             val out = BufferedWriter(FileWriter(f))
diff --git a/samples/client/petstore/kotlin/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 2abf02f23b4286668e47f348784c67e42773d74c..3868a5465d33bf46b645a862cc60b6ce930a0717 100644
--- a/samples/client/petstore/kotlin/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -129,6 +129,7 @@ open class ApiClient(val baseUrl: String) {
         }
         if (T::class.java == File::class.java) {
             // return tempfile
+            // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
             val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
             f.deleteOnExit()
             val out = BufferedWriter(FileWriter(f))