diff -r 515331e0ca0c Doc/library/argparse.rst
--- a/Doc/library/argparse.rst	Sun Nov 02 22:35:47 2014 +0200
+++ b/Doc/library/argparse.rst	Sun Nov 02 20:33:44 2014 -0500
@@ -1499,6 +1499,9 @@
    * parser_class - class which will be used to create sub-parser instances, by
      default the class of the current parser (e.g. ArgumentParser)
 
+   * action - The basic type of action to be taken when this argument is
+     encountered at the command line.
+
    * dest - name of the attribute under which sub-command name will be
      stored; by default None and no value is stored