diff --git a/webrtc/.gitignore b/webrtc/.gitignore
index 9c8d698f37..b5abe8ef68 100644
--- a/webrtc/.gitignore
+++ b/webrtc/.gitignore
@@ -1,2 +1,29 @@
-# This file is for projects that checkout webrtc/ directly (e.g. Chromium).
-*.mk
+# This file is for projects that checkout webrtc/ directly (e.g. Chromium). It
+# is a truncated copy of the .gitignore file in the parent directory.
+*.DS_Store
+*.Makefile
+*.host.mk
+*.ncb
+*.ninja
+*.props
+*.pyc
+*.rules
+*.scons
+*.sdf
+*.sln
+*.suo
+*.target.mk
+*.targets
+*.user
+*.vcproj
+*.vcxproj
+*.vcxproj.filters
+*.vpj
+*.vpw
+*.vpwhistu
+*.vtg
+*.xcodeproj
+*_proto.xml
+*_proto_cpp.xml
+*~
+.*.sw?