diff --git a/README.md b/README.md
index c472dae9a..b89e8aaf6 100644
--- a/README.md
+++ b/README.md
@@ -926,7 +926,6 @@ isBoolean(value);
 | `@IsPhoneNumber(region: string)`                       | Checks if the string is a valid phone number using libphonenumber-js.                                                                                                                                 |
 | `@IsMongoId()`                                         | Checks if the string is a valid hex-encoded representation of a MongoDB ObjectId.                                                                                                                     |
 | `@IsMultibyte()`                                       | Checks if the string contains one or more multibyte chars.                                                                                                                                            |
-| `@IsNumberString(options?: IsNumericOptions)`          | Checks if the string is numeric.                                                                                                                                                                      |
 | `@IsSurrogatePair()`                                   | Checks if the string contains any surrogate pairs chars.                                                                                                                                              |
 | `@IsTaxId()`                                           | Checks if the string is a valid tax ID. Default locale is `en-US`.                                                                                                                                    |
 | `@IsUrl(options?: IsURLOptions)`                       | Checks if the string is a URL.                                                                                                                                                                        |