diff --git a/core/5.0/string.d.ts b/core/5.0/string.d.ts
index c46a756..117cb95 100644
--- a/core/5.0/string.d.ts
+++ b/core/5.0/string.d.ts
@@ -61,7 +61,7 @@ declare namespace string {
         pattern: string,
         init?: number,
         plain?: boolean
-    ): LuaMultiReturn<[number, number, ...string[]] | []>;
+    ): LuaMultiReturn<[number?, number?, ...string[]] | []>;
 
     /**
      * Returns a formatted version of its variable number of arguments following
diff --git a/core/string.d.ts b/core/string.d.ts
index 0a10e5d..6c3bea4 100644
--- a/core/string.d.ts
+++ b/core/string.d.ts
@@ -62,7 +62,7 @@ declare namespace string {
         pattern: string,
         init?: number,
         plain?: boolean
-    ): LuaMultiReturn<[number, number, ...string[]] | []>;
+    ): LuaMultiReturn<[number?, number?, ...string[]] | []>;
 
     /**
      * Returns a formatted version of its variable number of arguments following
@@ -177,7 +177,7 @@ declare namespace string {
      * returned. A third, optional numeric argument init specifies where to start
      * the search; its default value is 1 and can be negative.
      */
-    function match(s: string, pattern: string, init?: number): LuaMultiReturn<string[]>;
+    function match(s: string, pattern: string, init?: number): LuaMultiReturn<[string[] | null]>;
 
     /**
      * Returns a string that is the concatenation of `n` copies of the string `s`.