diff --git a/.gitignore b/.gitignore
index 0a29939..aaefb08 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,8 @@
 /build_root/
 /logs/
 /www/
+# temporary lock file created while building the docs
+build_docs.lock
 
 
 # Created by https://www.gitignore.io/api/python