diff --git a/java/classpath_fragment.go b/java/classpath_fragment.go
index 2e05823..7422fa2 100644
--- a/java/classpath_fragment.go
+++ b/java/classpath_fragment.go
@@ -143,6 +143,8 @@
 	android.WriteFileRule(ctx, output, content.String())
 }
 
+// Returns AndroidMkEntries objects to install generated classpath.proto.
+// Do not use this to install into APEXes as the injection of the generated files happen separately for APEXes.
 func (c *ClasspathFragmentBase) androidMkEntries() []android.AndroidMkEntries {
 	return []android.AndroidMkEntries{{
 		Class:      "ETC",