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diff --git a/doc/protocol.txt b/doc/protocol.txt
index 6dd4cf6..6ce04eb 100644
--- a/doc/protocol.txt
+++ b/doc/protocol.txt
@@ -478,6 +478,9 @@ evicted_time Seconds since the last access for the most recent item
outofmemory Number of times the underlying slab class was unable to
store a new item. This means you are running with -M or
an eviction failed.
+tailrepairs Number of times we self-healed a slab with a refcount
+ leak. If this counter is increasing a lot, please
+ report your situation to the developers.
Note this will only display information about slabs which exist, so an empty
cache will return an empty set.