diff --git a/doc/proto_00000500.txt b/doc/proto_00000500.txt
index 752e5d5..05f100c 100644
--- a/doc/proto_00000500.txt
+++ b/doc/proto_00000500.txt
@@ -1,4 +1,4 @@
-Detailed specification of protocol in version 00000403
+Detailed specification of protocol in version 00000500
 ======================================================
 
 CMC = 2 byte Cache Miss Counter, increased every time it is used