diff --git a/_yaml/data-functions.yml b/_yaml/data-functions.yml
index a4ff6f78a..832b3bfec 100644
--- a/_yaml/data-functions.yml
+++ b/_yaml/data-functions.yml
@@ -235,9 +235,9 @@ df_number:
     description: Converts a number to a boolean. <code>0</code> converts to <code>false</code>. All other values convert to <code>true</code>.
   - funcName: toDateTime
     args:
-      - argName: fmt
+      - argName: format
         optional: true
-        longName: Format
+        longName: String
         type: String enum
         description: Can be <code>ms</code> (milliseconds), <code>s</code> (seconds), or <code>excel</code> (Excel 1900). Defaults to milliseconds.
     returns: Date