diff --git a/.gitignore b/.gitignore
index 687b1ead85..adae2ca669 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,6 +3,9 @@
 /build/
 /bundle/
 
+# It's common to configure the PLTADDONDIR to be here.
+/add-on/
+
 # Everything below makes sense on any package repository, so it's
 # stuff that should be put into each such repository. The same holds
 # for ".mailmap" (which some people can decide if they want to thin it