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-rw-r--r--include/zmq.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/zmq.h b/include/zmq.h
index 63c8434..0bada1e 100644
--- a/include/zmq.h
+++ b/include/zmq.h
@@ -162,6 +162,7 @@ ZMQ_EXPORT void *zmq_socket (void *context, int type);
ZMQ_EXPORT int zmq_close (void *s);
// Sets an option on the socket.
+// EINVAL - unknown option, a value with incorrect length or an invalid value.
ZMQ_EXPORT int zmq_setsockopt (void *s, int option_, void *optval_,
size_t optvallen_);