diff --git a/android/sdk.go b/android/sdk.go
index e644806..42c8ffa 100644
--- a/android/sdk.go
+++ b/android/sdk.go
@@ -359,6 +359,8 @@
 
 	// SdkMemberType returns the SdkMemberType that will be used to automatically add the child module
 	// to the sdk.
+	//
+	// Returning nil will prevent the module being added to the sdk.
 	SdkMemberType(child Module) SdkMemberType
 
 	// ExportMember determines whether a module added to the sdk through this tag will be exported