diff --git a/vlib/os/os.v b/vlib/os/os.v
index bbcd68cca1c2e0..4a58b8be34770e 100644
--- a/vlib/os/os.v
+++ b/vlib/os/os.v
@@ -881,7 +881,7 @@ pub fn execute_or_exit(cmd string) Result {
 	return res
 }
 
-// execute_opt returns the os.Result of executing `cmd`, or an error on failure.
+// execute_opt returns the os.Result of executing `cmd`, or an error with its output on failure.
 pub fn execute_opt(cmd string) !Result {
 	res := execute(cmd)
 	if res.exit_code != 0 {