README.md in dentaku-3.4.1 vs README.md in dentaku-3.4.2

- old
+ new

@@ -150,9 +150,11 @@
 
 Selections: `CASE` (syntax see [spec](https://github.com/rubysolo/dentaku/blob/master/spec/calculator_spec.rb#L292))
 
 String: `LEFT`, `RIGHT`, `MID`, `LEN`, `FIND`, `SUBSTITUTE`, `CONCAT`, `CONTAINS`
 
+Collection: `MAP`, `FILTER`, `ALL`, `ANY`, `PLUCK`
+
 RESOLVING DEPENDENCIES
 ----------------------
 
 If your formulas rely on one another, they may need to be resolved in a
 particular order. For example: