diff --git a/spec/functions/number.md b/spec/functions/number.md
index ccf3b170af..c64499fa3e 100644
--- a/spec/functions/number.md
+++ b/spec/functions/number.md
@@ -463,7 +463,6 @@ The following options and their values are required to be available on the funct
   - `symbol` (default)
   - `name`
   - `code`
-  - `formalSymbol`
   - `never` (this is called `hidden` in ICU)
 - `useGrouping`
   - `auto` (default)