diff --git a/src/items/array.ts b/src/items/array.ts
index e15afd6..b5aabce 100644
--- a/src/items/array.ts
+++ b/src/items/array.ts
@@ -15,6 +15,14 @@ export default class SchemaArray<Type extends SchemaItem> extends SchemaItem<Arr
 		return this
 	}
 
+	/**
+	* split a string into an array
+	* @param [separator] default:`,` the separator to use
+	*/
+	public split(separator = ',') {
+		this.addPreProcess((it) => typeof it === 'string' ? it.split(separator) : it)
+	}
+
 	public parse(input: unknown, options?: { fast?: boolean }): ValidationResult<Array<SchemaInfer<Type>>> {
 
 		// check errors from itself