diff --git a/packages/observe-sequence/observe_sequence.js b/packages/observe-sequence/observe_sequence.js
index e160dbcd3d..783634e296 100644
--- a/packages/observe-sequence/observe_sequence.js
+++ b/packages/observe-sequence/observe_sequence.js
@@ -22,7 +22,7 @@ ObserveSequence = {
   //
   // @param sequenceFunc {Function} a reactive function returning a
   //     sequence type. The currently supported sequence types are:
-  //     'null', arrays and cursors.
+  //     Array, Cursor, and null.
   //
   // @param callbacks {Object} similar to a specific subset of
   //     callbacks passed to `cursor.observe`