diff --git a/_mobile/android.md b/_mobile/android.md
index ea781dbf05f8..eb25100b8da6 100644
--- a/_mobile/android.md
+++ b/_mobile/android.md
@@ -295,7 +295,7 @@ They are specified as environment variables:
 
 `ANDROID_HOME` - path to [Android SDK](https://developer.android.com/studio/command-line/sdkmanager.html)
 
-`ANDROID_NDK` - path to [Android NDK](https://developer.android.com/studio/projects/install-ndk)
+`ANDROID_NDK` - path to [Android NDK](https://developer.android.com/studio/projects/install-ndk). It's recommended to use NDK 21.x.
 
 `GRADLE_HOME` - path to [gradle](https://gradle.org/releases/)