diff --git a/apiv1/controllers/CourseController.js b/apiv1/controllers/CourseController.js
index 063c27a5..7947d4f8 100644
--- a/apiv1/controllers/CourseController.js
+++ b/apiv1/controllers/CourseController.js
@@ -192,6 +192,7 @@ module.exports = {
                     Course.shortname = req.body.shortname ? req.body.shortname : Course.shortname;
                     Course.lessons = req.body.lessons ? req.body.lessons : Course.lessons;
                     Course.difficulty = req.body.difficulty ? req.body.difficulty : Course.difficulty;
+                    Course.categories = req.body.categories ? req.body.categories : Course.categories;
                     Course.description = req.body.description ? req.body.description : Course.description;
                     Course.lessons = req.body.lessons ? req.body.lessons : Course.lessons;
 
diff --git a/apiv1/models/CourseModel.js b/apiv1/models/CourseModel.js
index fc5bc76e..2f2ce6b9 100644
--- a/apiv1/models/CourseModel.js
+++ b/apiv1/models/CourseModel.js
@@ -10,7 +10,14 @@ let LessonSchema = new Schema({
 let CourseSchema = new Schema({
     'shortname': String,
     'name': String,
-    'difficulty': Number,
+    'difficulty': {
+        type: Number,
+        enum: [0, 1, 2, 3],
+    },
+    'categories': [{
+        type: String,
+        enum: ["geometry", "transformations", "animations", "groups", "firstTimer", "teachers", "misc"],
+    }],
     'description': String,
     'lessons': [LessonSchema]
 });
diff --git a/package-lock.json b/package-lock.json
index 556fd818..7ec29f1a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -3077,7 +3077,7 @@
       "dependencies": {
         "combined-stream": {
           "version": "1.0.6",
-          "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.6.tgz",
+          "resolved": "http://registry.npmjs.org/combined-stream/-/combined-stream-1.0.6.tgz",
           "integrity": "sha1-cj599ugBrFYTETp+RFqbactjKBg=",
           "dev": true,
           "requires": {
@@ -3146,8 +3146,7 @@
         "ansi-regex": {
           "version": "2.1.1",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "aproba": {
           "version": "1.2.0",
@@ -3190,8 +3189,7 @@
         "code-point-at": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "concat-map": {
           "version": "0.0.1",
@@ -3202,8 +3200,7 @@
         "console-control-strings": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "core-util-is": {
           "version": "1.0.2",
@@ -3320,8 +3317,7 @@
         "inherits": {
           "version": "2.0.3",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "ini": {
           "version": "1.3.5",
@@ -3333,7 +3329,6 @@
           "version": "1.0.0",
           "bundled": true,
           "dev": true,
-          "optional": true,
           "requires": {
             "number-is-nan": "^1.0.0"
           }
@@ -3356,14 +3351,12 @@
         "minimist": {
           "version": "0.0.8",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "minipass": {
           "version": "2.3.5",
           "bundled": true,
           "dev": true,
-          "optional": true,
           "requires": {
             "safe-buffer": "^5.1.2",
             "yallist": "^3.0.0"
@@ -3382,7 +3375,6 @@
           "version": "0.5.1",
           "bundled": true,
           "dev": true,
-          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -3476,7 +3468,6 @@
           "version": "1.4.0",
           "bundled": true,
           "dev": true,
-          "optional": true,
           "requires": {
             "wrappy": "1"
           }
@@ -3562,8 +3553,7 @@
         "safe-buffer": {
           "version": "5.1.2",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "safer-buffer": {
           "version": "2.1.2",
@@ -3599,7 +3589,6 @@
           "version": "1.0.2",
           "bundled": true,
           "dev": true,
-          "optional": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",
@@ -3619,7 +3608,6 @@
           "version": "3.0.1",
           "bundled": true,
           "dev": true,
-          "optional": true,
           "requires": {
             "ansi-regex": "^2.0.0"
           }
@@ -3663,14 +3651,12 @@
         "wrappy": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "yallist": {
           "version": "3.0.3",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         }
       }
     },
@@ -7476,7 +7462,7 @@
       "dependencies": {
         "minimist": {
           "version": "1.2.0",
-          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "resolved": "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
           "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
           "dev": true
         }