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-rw-r--r--proto.pod4
1 files changed, 4 insertions, 0 deletions
diff --git a/proto.pod b/proto.pod
index 97df5b8..09c3205 100644
--- a/proto.pod
+++ b/proto.pod
@@ -70,6 +70,10 @@ the REGISTER command.
Indicates that the sender of the message is not interested anymore in receiving
tuples matching the pattern that has previously been registered with REGISTER.
+An UNREGISTER message with a $pid not known to the receiver (e.g. it has
+already been UNREGISTER'ed or has never been REGISTER'ed previously) should be
+ignored.
+
=item TUPLE $tid $tuple
Passes a tuple from the sending side to the receiving side. Every tuple is only