diff --git a/validation.md b/validation.md
index 119aecef47..351cf43f8c 100644
--- a/validation.md
+++ b/validation.md
@@ -650,6 +650,7 @@ Below is a list of all available validation rules and their function:
[MIME Types](#rule-mimetypes)
[MIME Type By File Extension](#rule-mimes)
[Min](#rule-min)
+[Multiple Of](#multiple-of)
[Not In](#rule-not-in)
[Not Regex](#rule-not-regex)
[Nullable](#rule-nullable)
@@ -999,6 +1000,11 @@ A full listing of MIME types and their corresponding extensions may be found at
The field under validation must have a minimum _value_. Strings, numerics, arrays, and files are evaluated in the same fashion as the [`size`](#rule-size) rule.
+
+#### multiple_of:_value_
+
+The field under validation must be a multiple of _value_. This can be useful when validating a number input that utilises the `step` attribute.
+
#### not_in:_foo_,_bar_,...