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-rw-r--r--libxcb/src/xcbext.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/libxcb/src/xcbext.h b/libxcb/src/xcbext.h
index 98b3c93c1..4e1f2f73d 100644
--- a/libxcb/src/xcbext.h
+++ b/libxcb/src/xcbext.h
@@ -66,6 +66,7 @@ unsigned int xcb_send_request(xcb_connection_t *c, int flags, struct iovec *vect
* callback which XCB can call when it wants the write side of the
* socket back to make a request. This callback synchronizes with the
* external socket owner and flushes any output queues if appropriate.
+ * The callback might be called from different threads at the same time.
* If you are sending requests which won't cause a reply, please note the
* comment for xcb_writev which explains some sequence number wrap issues.
* */