diff --git a/ontology/update.py b/ontology/update.py
index b0acdab..de51c31 100755
--- a/ontology/update.py
+++ b/ontology/update.py
@@ -41,7 +41,11 @@ if __name__ == '__main__':
     tree = defaultdict(dict)
 
     for keyword in keywords:
-        parent, child = keyword.split(': ')
+        if ': ' not in keyword:
+            parent = 'other'
+            child = keyword
+        else:
+            parent, child = keyword.split(': ', 1)
         path = find_path(parent)
         if path:
             p = tree