diff --git a/.gitignore b/.gitignore
index 3b47f9c..4182ccc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -40,3 +40,4 @@ CPLD/LCMXO*/impl1/*
 !CPLD/LCMXO*/impl1/*.twr
 !CPLD/LCMXO*/impl1/*.tw1
 *.bak
+*.lck