diff --git a/tree_maker/NodeJob.py b/tree_maker/NodeJob.py
index 4cf86e67a071844b2d085b562eb5368565b8976c..52afd48a3777ea055170ae62118da817377f2373 100644
--- a/tree_maker/NodeJob.py
+++ b/tree_maker/NodeJob.py
@@ -136,6 +136,9 @@ class NodeJob(NodeJobBase, NodeMixin):  # Add Node feature
         return not self.has_been(tag)
         
     def tag_as(self, tag):
+        '''
+        This is to tag the node's activity.
+        '''
         tree_maker.tag.tag_it(self.log_file, tag)
         
     def find(self, **kwargs):