diff --git a/tensorflow_fold/blocks/plan.py b/tensorflow_fold/blocks/plan.py
index 8895170..5984cb0 100644
--- a/tensorflow_fold/blocks/plan.py
+++ b/tensorflow_fold/blocks/plan.py
@@ -225,7 +225,7 @@ def register(unused_flag_def, name, default, unused_docstring):
 def _register_options(register, default_plan_name='plan'):
   """Calls a function once for each option a plan needs.
 
-  Arguments:
+  Args:
     register: Register is a function which takes four arguments, namely,
        1. The function you'd use to define the option as a flag.
        2. The name of the option.