diff --git a/glib/gshell.c b/glib/gshell.c
index 5ae58ffb5..315f50226 100644
--- a/glib/gshell.c
+++ b/glib/gshell.c
@@ -600,8 +600,8 @@ tokenize_command_line (const gchar *command_line,
 /**
  * g_shell_parse_argv:
  * @command_line: command line to parse
- * @argcp: return location for number of args
- * @argvp: return location for array of args
+ * @argcp: (out): return location for number of args
+ * @argvp: (out) (array length=argcp zero-terminated=1): return location for array of args
  * @error: return location for error
  * 
  * Parses a command line into an argument vector, in much the same way