Document tag set.

2018-09-19 13:00:35 +10:00
parent 2e29ff8981
commit 0ba159f97d
1 changed files with 3 additions and 0 deletions
@@ -429,6 +429,9 @@ Variables are set with the `Vars{"key": "value", ...}` option. Undefined
 variable references in the grammar will result in an error at construction
 time.

+Variables can also be set via the `set:"K=V"` tag. In this case, those variables will be available for that
+node and all children. This is useful for composition by allowing the same struct to be reused.
+
 When interpolating into flag or argument help strings, some extra variables
 are defined from the value itself: