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-rw-r--r--extensions/libipt_realm.man2
1 files changed, 2 insertions, 0 deletions
diff --git a/extensions/libipt_realm.man b/extensions/libipt_realm.man
index a40b1adc..72dff9b2 100644
--- a/extensions/libipt_realm.man
+++ b/extensions/libipt_realm.man
@@ -5,3 +5,5 @@ setups involving dynamic routing protocols like BGP.
Matches a given realm number (and optionally mask). If not a number, value
can be a named realm from /etc/iproute2/rt_realms (mask can not be used in
that case).
+Both value and mask are four byte unsigned integers and may be specified in
+decimal, hex (by prefixing with "0x") or octal (if a leading zero is given).