diff --git a/man/sd_event_add_io.xml b/man/sd_event_add_io.xml
index 4f2b09bf59..398b938e3c 100644
--- a/man/sd_event_add_io.xml
+++ b/man/sd_event_add_io.xml
@@ -161,6 +161,12 @@
"floating", and will be destroyed implicitly when the event loop
itself is destroyed.
+ Note that this call does not take possession of the file descriptor passed in, ownership (and thus
+ the duty to close it when it is no longer needed) remains with the caller. However, with the
+ sd_event_source_set_io_fd_own() call (see below) the event source may optionally
+ take ownership of the file descriptor after the event source has been created. In that case the file
+ descriptor is closed automatically as soon as the event source is released.
+
It is recommended to use
sd_event_add_io() only in conjunction with
file descriptors that have O_NONBLOCK set, to