validation of URL fields
diff --git a/planetstack/core/models/plcorebase.py b/planetstack/core/models/plcorebase.py
index dee8a87..3bceb08 100644
--- a/planetstack/core/models/plcorebase.py
+++ b/planetstack/core/models/plcorebase.py
@@ -94,6 +94,8 @@
             l = []
             if field.blank==False:
                 l.append("notBlank")
+            if field.__class__.__name__=="URLField":
+                l.append("url")
             validators[field.name] = l
         return validators
 
@@ -144,6 +146,8 @@
             l = []
             if field.blank==False:
                 l.append("notBlank")
+            if field.__class__.__name__=="URLField":
+                l.append("url")
             validators[field.name] = l
         return validators