diff --git a/pipelinewise/cli/schemas/tap.json b/pipelinewise/cli/schemas/tap.json
index 0c68b69c2..460a56bc8 100644
--- a/pipelinewise/cli/schemas/tap.json
+++ b/pipelinewise/cli/schemas/tap.json
@@ -48,7 +48,8 @@
           "HASH-SKIP-FIRST-8",
           "HASH-SKIP-FIRST-9",
           "MASK-DATE",
-          "MASK-NUMBER"
+          "MASK-NUMBER",
+          "MASK-HIDDEN"
           ] }
       },
       "required": [ "column", "type" ]
@@ -101,4 +102,4 @@
      "target",
      "schemas"
   ]
-}
\ No newline at end of file
+}