diff --git a/core/5.0/math.d.ts b/core/5.0/math.d.ts
index fcbfa1f..f52893b 100644
--- a/core/5.0/math.d.ts
+++ b/core/5.0/math.d.ts
@@ -95,6 +95,12 @@ declare namespace math {
      */
     function min(x: number, ...numbers: number[]): number;
 
+    /**
+     * Returns the remainder of the division of x by y that rounds the quotient
+     * towards zero. (integer/float)
+     */
+    function mod(x: number, y: number): number;
+
     /**
      * The value of π.
      */
diff --git a/package-lock.json b/package-lock.json
index 51ee9ed..a823693 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
     "name": "lua-types",
-    "version": "2.13.0",
+    "version": "2.13.1",
     "lockfileVersion": 2,
     "requires": true,
     "packages": {
         "": {
             "name": "lua-types",
-            "version": "2.13.0",
+            "version": "2.13.1",
             "license": "MIT",
             "devDependencies": {
                 "@types/jest": "^26.0.20",
diff --git a/package.json b/package.json
index 057c076..8b8472d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "lua-types",
-    "version": "2.13.0",
+    "version": "2.13.1",
     "description": "TypeScript definitions for Lua standard library",
     "keywords": [
         "lua",