commit 5631e097ad540fad196795a4efad463d3060fbbd
author Jesse van den Kieboom <jessevdk@gmail.com> Sat Oct 10 21:16:04 2015 +0200
committer Jesse van den Kieboom <jessevdk@gmail.com> Sat Oct 10 21:16:04 2015 +0200
tree 7de15580afb434313980287aac400823c29a3c2e
parent 1c008c186a1945576a96a77f6d066014a1e9aa1e

Improve documentation of 'optional'

flags.go

diff --git a/flags.go b/flags.go
index 6bf736b..641fe01 100644
--- a/flags.go
+++ b/flags.go
@@ -84,7 +84,9 @@
                       displayed in generated man pages (optional)
     no-flag:          if non-empty this field is ignored as an option (optional)
 
-    optional:       whether an argument of the option is optional (optional)
+    optional:       whether an argument of the option is optional. When an
+                    argument is optional it can only be specified using
+                    --option=argument (optional)
     optional-value: the value of an optional option when the option occurs
                     without an argument. This tag can be specified multiple
                     times in the case of maps or slices (optional)