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-rw-r--r--include/block/block-common.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/block/block-common.h b/include/block/block-common.h
index 93196229ac..e15395f2cb 100644
--- a/include/block/block-common.h
+++ b/include/block/block-common.h
@@ -65,6 +65,9 @@
  * scheduling a BH in the bottom half that runs the respective non-coroutine
  * function. The coroutine yields after scheduling the BH and is reentered when
  * the wrapped function returns.
+ *
+ * If the first parameter of the function is a BlockDriverState, BdrvChild or
+ * BlockBackend pointer, the AioContext lock for it is taken in the wrapper.
  */
 #define no_co_wrapper