--- a/.gitignore
+++ b/.gitignore
@@ -13,16 +13,17 @@ ID
 .*.sw[a-z]
 
 # User files that may appear at the root
 /.mozconfig*
 /mozconfig
 /configure
 /config.cache
 /config.log
+/.clang_complete
 
 # Empty marker file that's generated when we check out NSS
 security/manager/.nss.checkout
 
 # Build directories
 /obj*/
 
 # Build directories for js shell

--- a/.hgignore
+++ b/.hgignore
@@ -12,16 +12,17 @@
 .[^/]*\.sw.$
 
 # User files that may appear at the root
 ^\.mozconfig
 ^mozconfig*
 ^configure$
 ^config\.cache$
 ^config\.log$
+^\.clang_complete
 
 # Empty marker file that's generated when we check out NSS
 ^security/manager/\.nss\.checkout$
 
 # Build directories
 ^obj
 
 # Build directories for js shell