1 files changed, 1 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
index 82f42f5..de525c3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 *~
+*.bak
 \#*.thy#
 \#*.ML#