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-rw-r--r--doc/zmq_msg_init_data.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/doc/zmq_msg_init_data.txt b/doc/zmq_msg_init_data.txt
index 8378757..a36787c 100644
--- a/doc/zmq_msg_init_data.txt
+++ b/doc/zmq_msg_init_data.txt
@@ -28,6 +28,9 @@ supplied to _zmq_msg_init_data()_.
CAUTION: Never access 'zmq_msg_t' members directly, instead always use the
_zmq_msg_ family of functions.
+CAUTION: The deallocation function 'ffn' needs to be thread-safe, since it
+will be called from an arbitrary thread.
+
CAUTION: The functions _zmq_msg_init()_, _zmq_msg_init_data()_ and
_zmq_msg_init_size()_ are mutually exclusive. Never initialize the same
'zmq_msg_t' twice.