diff --git a/Elisp.gitignore b/Elisp.gitignore
index 89a75977..25f2b431 100644
--- a/Elisp.gitignore
+++ b/Elisp.gitignore
@@ -5,4 +5,7 @@
 .cask
 
 # Backup files
-*~
\ No newline at end of file
+*~
+
+# Undo-tree save-files
+*.~undo-tree
\ No newline at end of file