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diff --git a/doc/zmq.md b/doc/zmq.md
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@@ -111,7 +111,9 @@ using other means such as firewalling.
Note that when the block chain tip changes, a reorganisation may occur
and just the tip will be notified. It is up to the subscriber to
-retrieve the chain from the last known block to the new tip.
+retrieve the chain from the last known block to the new tip. Also note
+that no notification occurs if the tip was in the active chain - this
+is the case after calling invalidateblock RPC.
There are several possibilities that ZMQ notification can get lost
during transmission depending on the communication type you are