diff --git a/lisp/cedet/.gitignore b/lisp/cedet/.gitignore
new file mode 100644
index 00000000000..976586eb53b
--- /dev/null
+++ b/lisp/cedet/.gitignore
@@ -0,0 +1,8 @@
+## Generated grammar files.
+semantic/bovine/c-by.el
+semantic/bovine/make-by.el
+semantic/bovine/scm-by.el
+semantic/wisent/javat-wy.el
+semantic/wisent/js-wy.el
+semantic/wisent/python-wy.el
+srecode/srt-wy.el