small tweak to docstring
diff --git a/parser.go b/parser.go
index f95a92d..03ccb76 100644
--- a/parser.go
+++ b/parser.go
@@ -26,7 +26,7 @@
// UnknownOptionsHandler is a function which gets called when the parser
// encounters an unknown option. The function receives the unknown option
- // name and the remaining command line arguments.
+ // name, its value if specified with '=', and the remaining command line arguments.
// It should return a new list of remaining arguments to continue parsing,
// or an error to indicate a parse failure.
UnknownOptionHandler func(option string, val *string, args []string) ([]string, error)
