diff --git a/common/lib/capa/capa/capa_problem.py b/common/lib/capa/capa/capa_problem.py
index 9a5a15a696..d9f0156e6f 100644
--- a/common/lib/capa/capa/capa_problem.py
+++ b/common/lib/capa/capa/capa_problem.py
@@ -53,7 +53,8 @@ entry_types = ['textline',
                'radiogroup',
                'checkboxgroup',
                'filesubmission',
-               'javascriptinput',]
+               'javascriptinput',
+               'crystallography',]
 
 # extra things displayed after "show answers" is pressed
 solution_types = ['solution']