diff --git a/attract_server/node_types/task.py b/attract_server/node_types/task.py
index dc07756..7de52aa 100644
--- a/attract_server/node_types/task.py
+++ b/attract_server/node_types/task.py
@@ -18,6 +18,7 @@ node_type_task = {
         'filepath': {
             'type': 'string',
         },
+        # TODO: describe what this is.
         'revision': {
             'type': 'integer',
         },