diff --git a/tag_database b/tag_database
index 675b144b9..d897e319c 100644
--- a/tag_database
+++ b/tag_database
@@ -88,7 +88,7 @@ objectFromPairs:object
 objectToPairs:object
 onUserInputChange:browser
 orderBy:object
-palindrome:math
+palindrome:string
 percentile:math
 pick:array
 pipeFunctions:adapter