diff --git a/README.md b/README.md
index 1985176753626792605e39dfbfcaeac76444dccf..fc35934f2df6225b0cdc98859472293c0ab5b93b 100644
--- a/README.md
+++ b/README.md
@@ -92,7 +92,7 @@ messages are delivered in the order they were sent.
 
 #Protocol
 
-The gRPC protocol specifies the abstract requirements for communication between
+The [gRPC protocol](https://github.com/grpc/grpc-common/blob/master/PROTOCOL-HTTP2.md) specifies the abstract requirements for communication between
 clients and servers. A concrete embedding over HTTP/2 completes the picture by
 fleshing out the details of each of the required operations.