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diff --git a/Documentation/gitprotocol-common.adoc b/Documentation/gitprotocol-common.adoc
index cdc9d6e707..b4a5316ca4 100644
--- a/Documentation/gitprotocol-common.adoc
+++ b/Documentation/gitprotocol-common.adoc
@@ -21,11 +21,13 @@ ABNF Notation
ABNF notation as described by RFC 5234 is used within the protocol documents,
except the following replacement core rules are used:
+
----
HEXDIG = DIGIT / "a" / "b" / "c" / "d" / "e" / "f"
----
We also define the following common rules:
+
----
NUL = %x00
zero-id = 40*"0"