diff --git a/BUILD.md b/BUILD.md
index 875a1a89f9..bebc134e33 100644
--- a/BUILD.md
+++ b/BUILD.md
@@ -1046,6 +1046,17 @@ e.g. using the paths from our example
 
 Android Archive (AAR) files, which can be imported directly in Android Studio, will be generated in your_build_dir/java/build/outputs/aar, by using the above building commands with `--build_java`
 
+To build on Windows with `--build_java` enabled you must also:
+  - set JAVA_HOME to the path to your JDK install
+    - this could be the JDK from Android Studio, or a [standalone JDK install](https://www.oracle.com/java/technologies/javase-downloads.html)
+    - e.g. Powershell: `$env:JAVA_HOME="C:\Program Files\Java\jdk-15"`
+           CMD: `set JAVA_HOME=C:\Program Files\Java\jdk-15`
+  - install [Gradle](https://gradle.org/install/) and add the directory to the PATH
+    - e.g. Powershell: `$env:PATH="$env:PATH;C:\Gradle\gradle-6.6.1\bin"`
+           CMD: `set PATH=%PATH%;C:\Gradle\gradle-6.6.1\bin`
+  - run the build from an admin window
+    - the Java build needs permissions to create a symlink, which requires an admin window
+
 #### Android NNAPI Execution Provider
 
 If you want to use NNAPI Execution Provider on Android, see [NNAPI Execution Provider](/docs/execution_providers/NNAPI-ExecutionProvider.md).