diff --git a/.gitignore b/.gitignore
index 566550e..859398b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,6 +3,7 @@
 
 # User-specific files
 *.suo
+*.atsuo
 *.user
 *.userosscache
 *.sln.docstates