diff --git a/plugins/ruby/ruby-autogen-defs.rb b/plugins/ruby/ruby-autogen-defs.rb
index 945eebceb..f9858c949 100644
--- a/plugins/ruby/ruby-autogen-defs.rb
+++ b/plugins/ruby/ruby-autogen-defs.rb
@@ -354,7 +354,9 @@ module DFHack
             end
             def empty? ; length == 0 ; end
             def flatten ; map { |e| e.respond_to?(:flatten) ? e.flatten : e }.flatten ; end
-            def index(elem=nil, &b) ; (0...length).find { |i| b ? b[self[i]] : self[i] == elem } ; end
+            def index(e=nil, &b) ; (0...length).find { |i| b ? b[self[i]] : self[i] == e } ; end
+            def first ; self[0] ; end
+            def last ; self[length-1] ; end
         end
         class StaticArray < MemStruct
             attr_accessor :_tglen, :_length, :_indexenum, :_tg