diff --git a/docs/libcurl/curl_multi_wait.3 b/docs/libcurl/curl_multi_wait.3
index c266f2569..21ade930b 100644
--- a/docs/libcurl/curl_multi_wait.3
+++ b/docs/libcurl/curl_multi_wait.3
@@ -44,7 +44,9 @@ The calling application may pass additional curl_waitfd structures which are
 similar to \fIpoll(2)\fP's pollfd structure to be waited on in the same call.
 
 On completion, if \fInumfds\fP is supplied, it will be populated with the
-number of file descriptors on which interesting events occured.
+total number of file descriptors on which interesting events occured. This
+number can include both libcurl internal descriptors as well as descriptors
+provided in \fIextra_fds\fP.
 
 If no extra file descriptors are provided and libcurl has no file descriptor
 to offer to wait for, this function will return immediately.