diff --git a/doc/protocol.md b/doc/protocol.md
index 8a88b017..2391a7f5 100644
--- a/doc/protocol.md
+++ b/doc/protocol.md
@@ -23,7 +23,7 @@ messages, and, finally, a breakdown of the messages themselves.
 
 # License
 
-See LICENSE.md.
+See [LICENSE.md](../LICENSE.md).
 
 # Challenges