diff --git a/tools/dockerfile/grpc_base/README.md b/tools/dockerfile/grpc_base/README.md
index e3b5f2ef373..5c81b02425d 100644
--- a/tools/dockerfile/grpc_base/README.md
+++ b/tools/dockerfile/grpc_base/README.md
@@ -2,7 +2,8 @@ Base GRPC Dockerfile
 ====================
 
 Dockerfile for creating the base gRPC development Docker instance.
-For now, this assumes that the development will be done on GCE instances, with source code on Git-on-Borg.
+For now, this assumes that the development will be done on GCE instances,
+with source code on GitHub.
 
 As of 2015/02/02, it includes
 - git