start with a capital letter after a period
diff --git a/flags.go b/flags.go
index 8809cf6..dff1dc8 100644
--- a/flags.go
+++ b/flags.go
@@ -66,7 +66,7 @@
// If a required option is not present, the parser will return
// ErrRequired (optional)
// description: the description of the option (optional)
-// long-description: the long description of the option. currently only
+// long-description: the long description of the option. Currently only
// displayed in generated man pages (optional)
// no-flag: if non-empty this field is ignored as an option (optional)
//