diff --git a/common/lib/xmodule/xmodule/js/src/combinedopenended/display.coffee b/common/lib/xmodule/xmodule/js/src/combinedopenended/display.coffee
index 8c5461ff56..da41cad9ef 100644
--- a/common/lib/xmodule/xmodule/js/src/combinedopenended/display.coffee
+++ b/common/lib/xmodule/xmodule/js/src/combinedopenended/display.coffee
@@ -365,12 +365,14 @@ class @CombinedOpenEnded
       @errors_area.html(@out_of_sync_message)
 
   keydown_handler: (event) =>
+    #Previously, responses were submitted when hitting enter.  Add in a modifier that ensures that ctrl+enter is needed.
     if event.which == 17 && @is_ctrl==false
       @is_ctrl=true
     else if @is_ctrl==true && event.which == 13 && @child_state == 'assessing' && Rubric.check_complete()
       @save_assessment(event)
 
   keyup_handler: (event) =>
+    #Handle keyup event when ctrl key is released
     if event.which == 17 && @is_ctrl==true
       @is_ctrl=false
 
diff --git a/common/lib/xmodule/xmodule/js/src/peergrading/peer_grading_problem.coffee b/common/lib/xmodule/xmodule/js/src/peergrading/peer_grading_problem.coffee
index 7c2e9695b1..9483932f80 100644
--- a/common/lib/xmodule/xmodule/js/src/peergrading/peer_grading_problem.coffee
+++ b/common/lib/xmodule/xmodule/js/src/peergrading/peer_grading_problem.coffee
@@ -361,6 +361,7 @@ class @PeerGradingProblem
       @grade = Rubric.get_total_score()
 
   keydown_handler: (event) =>
+    #Previously, responses were submitted when hitting enter.  Add in a modifier that ensures that ctrl+enter is needed.
     if event.which == 17 && @is_ctrl==false
       @is_ctrl=true
     else if event.which == 13 && @submit_button.is(':visible') && @is_ctrl==true
@@ -370,6 +371,7 @@ class @PeerGradingProblem
         @submit_grade()
 
   keyup_handler: (event) =>
+    #Handle keyup event when ctrl key is released
     if event.which == 17 && @is_ctrl==true
       @is_ctrl=false
 
diff --git a/lms/static/coffee/src/staff_grading/staff_grading.coffee b/lms/static/coffee/src/staff_grading/staff_grading.coffee
index ca200570de..f4a3360d1e 100644
--- a/lms/static/coffee/src/staff_grading/staff_grading.coffee
+++ b/lms/static/coffee/src/staff_grading/staff_grading.coffee
@@ -234,12 +234,14 @@ class @StaffGrading
       @submit_button.show()
 
   keydown_handler: (event) =>
+    #Previously, responses were submitted when hitting enter.  Add in a modifier that ensures that ctrl+enter is needed.
     if event.which == 17 && @is_ctrl==false
       @is_ctrl=true
     else if @is_ctrl==true && event.which == 13 && !@list_view && Rubric.check_complete()
       @submit_and_get_next()
 
   keyup_handler: (event) =>
+    #Handle keyup event when ctrl key is released
     if event.which == 17 && @is_ctrl==true
       @is_ctrl=false