diff --git a/tools/patman/README b/tools/patman/README
index d4e7f36..8cffcd1 100644
--- a/tools/patman/README
+++ b/tools/patman/README
@@ -225,9 +225,16 @@
 	to update the log there and then, knowing that the script will
 	do the rest.
 
-Cc: Their Name <email>
+ Cc: Their Name <email>
 	This copies a single patch to another email address.
 
+Series-process-log: sort, uniq
+	This tells patman to sort and/or uniq the change logs. It is
+	assumed that each change log entry is only a single line long.
+	Use 'sort' to sort the entries, and 'uniq' to include only
+	unique entries. If omitted, no change log processing is done.
+	Separate each tag with a comma.
+
 Various other tags are silently removed, like these Chrome OS and
 Gerrit tags: