diff --git a/Documentation/Filters/Masking.md b/Documentation/Filters/Masking.md
index d15eea215..17a0f37f6 100644
--- a/Documentation/Filters/Masking.md
+++ b/Documentation/Filters/Masking.md
@@ -241,7 +241,7 @@ of the mask value to get the lengths to match.
                 "column": "creditcard"
             },
             "with": {
-                "value": "1234123412341234"
+                "value": "1234123412341234",
                 "fill": "0"
             },
             "applies_to": [ ... ],