diff --git a/src/os/exec.go b/src/os/exec.go
index 1ec94df9e0..58fc4dd59a 100644
--- a/src/os/exec.go
+++ b/src/os/exec.go
@@ -85,7 +85,8 @@ func FindProcess(pid int) (*Process, error) {
 }
 
 // StartProcess starts a new process with the program, arguments and attributes
-// specified by name, argv and attr.
+// specified by name, argv and attr. The argv slice will become os.Args in the
+// new process, and normally starts with the program name.
 //
 // StartProcess is a low-level interface. The os/exec package provides
 // higher-level interfaces.