readme

readme.md

@@ -13,11 +13,13 @@ go get gfx.cafe/open/gun
 ## how to use
 simply create a struct that is json encodable into what you need
 
+struct keys must be alphanumeric + _
+
 json is a subset of yaml, so your config file can be in JSON or YAML, however use yaml as your tags
 
 config files key by default is all lowercase of the field (this is different from JSON!)
 
-env vars WILL ALWAYS override, and ALWAYS ALL UPPERCASE, ALPHANUMERIC + _ ONLY
+env vars WILL ALWAYS override, and ALWAYS ALL UPPERCASE
 
 does NOT work with nested variables.