1 files changed, 3 insertions, 0 deletions
diff --git a/docs/examples/10-at-a-time.c b/docs/examples/10-at-a-time.c
index be3b6faee..50392259c 100644
--- a/docs/examples/10-at-a-time.c
+++ b/docs/examples/10-at-a-time.c
@@ -123,6 +123,9 @@ int main(void)
         return EXIT_FAILURE;
       }
 
+      /* In a real-world program you OF COURSE check the return that maxfd is
+         bigger than -1 so that the call to select() below makes sense! */
+
       if (curl_multi_timeout(cm, &L)) {
         fprintf(stderr, "E: curl_multi_timeout\n");
         return EXIT_FAILURE;