diff --git a/android/config.go b/android/config.go
index 1ed405b..df2c767 100644
--- a/android/config.go
+++ b/android/config.go
@@ -75,6 +75,9 @@
 	// Don't use bazel at all during module analysis.
 	AnalysisNoBazel SoongBuildMode = iota
 
+	// Symlink fores mode: merge two directory trees into a symlink forest
+	SymlinkForest
+
 	// Bp2build mode: Generate BUILD files from blueprint files and exit.
 	Bp2build