diff --git a/docs/en_us/data/source/internal_data_formats/tracking_logs.rst b/docs/en_us/data/source/internal_data_formats/tracking_logs.rst
index aaa15bdcdd..681a86c97f 100644
--- a/docs/en_us/data/source/internal_data_formats/tracking_logs.rst
+++ b/docs/en_us/data/source/internal_data_formats/tracking_logs.rst
@@ -2687,6 +2687,9 @@ the child module that was shown to the student.
    * - ``child_id``
      - string
      - ID of the module that displays to the student. 
+       
+       **History**: Renamed on 16 Oct 2014 from ``child-id`` to ``child_id``.
+       
 
 .. _student_cohort_events: