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diff --git a/Documentation/security/Smack.txt b/Documentation/security/Smack.txt
index 8a177e4b6e21..7a2d30c132e3 100644
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+++ b/Documentation/security/Smack.txt
@@ -117,6 +117,17 @@ access2
ambient
This contains the Smack label applied to unlabeled network
packets.
+change-rule
+ This interface allows modification of existing access control rules.
+ The format accepted on write is:
+ "%s %s %s %s"
+ where the first string is the subject label, the second the
+ object label, the third the access to allow and the fourth the
+ access to deny. The access strings may contain only the characters
+ "rwxat-". If a rule for a given subject and object exists it will be
+ modified by enabling the permissions in the third string and disabling
+ those in the fourth string. If there is no such rule it will be
+ created using the access specified in the third and the fourth strings.
cipso
This interface allows a specific CIPSO header to be assigned
to a Smack label. The format accepted on write is: