diff --git a/xwords4/Makefile b/xwords4/Makefile
index 5a2d804da..9a19ee78e 100644
--- a/xwords4/Makefile
+++ b/xwords4/Makefile
@@ -2,4 +2,6 @@
 tags:
 	etags $$(find . -name '*.c' -print \
 		-o -name '*.h' -print \
-		-o -name '*.cpp' -print)
+		-o -name '*.cpp' -print \
+		-o -name '*.java' -print \
+)