diff --git a/AUTHORS b/AUTHORS
index acabe68f24..7638c90396 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -218,3 +218,4 @@ Andrew Dekker <simultech@gmail.com>
 Christopher Lee <clee@edx.org>
 Mushtaq Ali <mushtaque.ali@arbisoft.com>
 Colin Fredericks <colin.fredericks@gmail.com>
+Xiaolu Xiong <beardeer@gmail.com>
diff --git a/lms/djangoapps/courseware/model_data.py b/lms/djangoapps/courseware/model_data.py
index 8a2b32b767..8d96b4fce4 100644
--- a/lms/djangoapps/courseware/model_data.py
+++ b/lms/djangoapps/courseware/model_data.py
@@ -544,7 +544,7 @@ class UserStateSummaryCache(DjangoOrmFieldCache):
         with them.
 
         Arguments:
-            fields (list of str): Field names to return values for
+            fields (list of :class:`~Field`): Fields to return values for
             xblocks (list of :class:`~XBlock`): XBlocks to load fields for
             aside_types (list of str): Asides to load field for (which annotate the supplied
                 xblocks).