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1 files changed, 4 insertions, 1 deletions
diff --git a/doc/user/msg.t b/doc/user/msg.t
index f58d677150..eb3cb3561a 100644
--- a/doc/user/msg.t
+++ b/doc/user/msg.t
@@ -50,7 +50,10 @@ wait for a message to arrive at a queue. Also, a task may poll
a queue for the arrival of a message.
The maximum length message which can be sent is set
-on a per message queue basis.
+on a per message queue basis. The message content must be copied in general
+to/from an internal buffer of the message queue or directly to a peer in
+certain cases. This copy operation is performed with interrupts disabled. So
+it is advisable to keep the messages as short as possible.
@subsection Building a Message Queue Attribute Set