PROTOCOL.md: fix a typo

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/PROTOCOL.md b/PROTOCOL.md
index 19f907e646174ad1bc7714818aa920147688d348..c179e89e8091df6be686c6aef1189df32c9b96bc 100644 (file)
--- a/PROTOCOL.md
+++ b/PROTOCOL.md
@@ -24,7 +24,7 @@ There is:
   * possibly branch(es) of history made by the client;
     this can rewind and be discarded
 
-There is a diagraph of updates.  Each update specifies the complete
+There is a digraph of updates.  Each update specifies the complete
 state of the piece.  The server maintains an authoritative history;
 the client only maintains the state of the piece.