diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..47e8959
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2022 Stefan Heller
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/lang/compile.rkt b/lang/compile.rkt
index ad85246..9728ddb 100644
--- a/lang/compile.rkt
+++ b/lang/compile.rkt
@@ -208,6 +208,7 @@
             ['- (Sub (assert-integer e1) (assert-integer e2))]
             ['* (runtime-int->bits (Mul (runtime-bits->int (assert-integer e1)) (runtime-bits->int(assert-integer e2))))]
             ['/ (runtime-int->bits (Div (runtime-bits->int (assert-integer e1)) (runtime-bits->int(assert-integer e2))))]
+            ['% (Rem (assert-integer e1) (assert-integer e2))]
             ['or (Or e1 e2)]
             ['and (And e1 e2)]
             ['xor (Xor e1 e2)]
diff --git a/lang/parse.rkt b/lang/parse.rkt
index eac5a98..15aeeac 100644
--- a/lang/parse.rkt
+++ b/lang/parse.rkt
@@ -73,7 +73,7 @@
            box unbox empty? cons? box? car cdr
            vector? vector-length string? string-length))
   (define op2
-    '(+ - < = * / << >> and or xor cons eq? make-vector vector-ref make-string string-ref))
+    '(+ - < = * / << >> % and or xor cons eq? make-vector vector-ref make-string string-ref))
   (define op3
     '(vector-set!))
    
diff --git a/package-lock.json b/package-lock.json
index ccc1685..b0b3516 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,7 +10,7 @@
       "license": "ISC",
       "dependencies": {
         "express": "^4.17.3",
-        "node-fetch": "^3.2.3"
+        "node-fetch": "^3.2.10"
       }
     },
     "node_modules/accepts": {
@@ -373,9 +373,9 @@
       }
     },
     "node_modules/node-fetch": {
-      "version": "3.2.3",
-      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-3.2.3.tgz",
-      "integrity": "sha512-AXP18u4pidSZ1xYXRDPY/8jdv3RAozIt/WLNR/MBGZAz+xjtlr90RvCnsvHQRiXyWliZF/CpytExp32UU67/SA==",
+      "version": "3.2.10",
+      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-3.2.10.tgz",
+      "integrity": "sha512-MhuzNwdURnZ1Cp4XTazr69K0BTizsBroX7Zx3UgDSVcZYKF/6p0CBe4EUb/hLqmzVhl0UpYfgRljQ4yxE+iCxA==",
       "dependencies": {
         "data-uri-to-buffer": "^4.0.0",
         "fetch-blob": "^3.1.4",
@@ -850,9 +850,9 @@
       "integrity": "sha512-/jKZoMpw0F8GRwl4/eLROPA3cfcXtLApP0QzLmUT/HuPCZWyB7IY9ZrMeKw2O/nFIqPQB3PVM9aYm0F312AXDQ=="
     },
     "node-fetch": {
-      "version": "3.2.3",
-      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-3.2.3.tgz",
-      "integrity": "sha512-AXP18u4pidSZ1xYXRDPY/8jdv3RAozIt/WLNR/MBGZAz+xjtlr90RvCnsvHQRiXyWliZF/CpytExp32UU67/SA==",
+      "version": "3.2.10",
+      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-3.2.10.tgz",
+      "integrity": "sha512-MhuzNwdURnZ1Cp4XTazr69K0BTizsBroX7Zx3UgDSVcZYKF/6p0CBe4EUb/hLqmzVhl0UpYfgRljQ4yxE+iCxA==",
       "requires": {
         "data-uri-to-buffer": "^4.0.0",
         "fetch-blob": "^3.1.4",
diff --git a/package.json b/package.json
index cfb413f..13c3764 100644
--- a/package.json
+++ b/package.json
@@ -18,7 +18,7 @@
   "homepage": "https://github.com/stefanhts/430_finalproj#readme",
   "dependencies": {
     "express": "^4.17.3",
-    "node-fetch": "^3.2.3"
+    "node-fetch": "^3.2.10"
   },
   "module": "true"
 }
diff --git a/tests/arithmetic/1.wkt b/tests/arithmetic/1.wkt
new file mode 100644
index 0000000..46fde05
--- /dev/null
+++ b/tests/arithmetic/1.wkt
@@ -0,0 +1,2 @@
+#lang wacket
+(% 10 3)
\ No newline at end of file
diff --git a/wat/ast.rkt b/wat/ast.rkt
index dd909b0..478f82d 100644
--- a/wat/ast.rkt
+++ b/wat/ast.rkt
@@ -61,6 +61,8 @@
 ;; Convenience for adding 64 bit integers.
 (struct Sub (i1 i2) #:prefab)
 
+(struct Rem (i1 i2) #:prefab)
+
 (struct Mul (i1 i2) #:prefab)
 
 (struct Div (i1 i2) #:prefab)
diff --git a/wat/printer.rkt b/wat/printer.rkt
index 448a6c3..8268864 100644
--- a/wat/printer.rkt
+++ b/wat/printer.rkt
@@ -231,6 +231,7 @@
         [(Sub i1 i2) (list "i64.sub"   (seq i1 i2))]
         [(Mul i1 i2) (list "i64.mul"   (seq i1 i2))]
         [(Div i1 i2) (list "i64.div_s" (seq i1 i2))]
+        [(Rem i1 i2) (list "i64.rem_s" (seq i1 i2))]
         [(And i1 i2) (list "i64.and"   (seq i1 i2))]
         [(Or  i1 i2) (list "i64.or"    (seq i1 i2))]
         [(Xor i1 i2) (list "i64.xor"   (seq i1 i2))]