diff --git a/cc/cc.go b/cc/cc.go
index 7a94f89..454a362 100644
--- a/cc/cc.go
+++ b/cc/cc.go
@@ -2992,6 +2992,9 @@
 	}
 }
 
+var _ android.ApexModule = (*Module)(nil)
+
+// Implements android.ApexModule
 func (c *Module) DepIsInSameApex(ctx android.BaseModuleContext, dep android.Module) bool {
 	depTag := ctx.OtherModuleDependencyTag(dep)
 	libDepTag, isLibDepTag := depTag.(libraryDependencyTag)
@@ -3025,6 +3028,7 @@
 	return true
 }
 
+// Implements android.ApexModule
 func (c *Module) ShouldSupportSdkVersion(ctx android.BaseModuleContext,
 	sdkVersion android.ApiLevel) error {
 	// We ignore libclang_rt.* prebuilt libs since they declare sdk_version: 14(b/121358700)