diff --git a/cc/androidmk.go b/cc/androidmk.go
index ef695b0..1c90aaf 100644
--- a/cc/androidmk.go
+++ b/cc/androidmk.go
@@ -248,6 +248,10 @@
 			entries.SubName = "." + library.stubsVersion()
 		}
 		entries.ExtraEntries = append(entries.ExtraEntries, func(entries *android.AndroidMkEntries) {
+			// Note library.skipInstall() has a special case to get here for static
+			// libraries that otherwise would have skipped installation and hence not
+			// have executed AndroidMkEntries at all. The reason is to ensure they get
+			// a NOTICE file make target which other libraries might depend on.
 			entries.SetBool("LOCAL_UNINSTALLABLE_MODULE", true)
 			if library.buildStubs() {
 				entries.SetBool("LOCAL_NO_NOTICE_FILE", true)