diff --git a/LocationAPI.json b/LocationAPI.json
index 1e4c8323240cf0a81c71b5b383d7b4ee35970fd4..c4739cbb55325c1fe9ee2fb55b1434376f99cb34 100644
--- a/LocationAPI.json
+++ b/LocationAPI.json
@@ -1270,6 +1270,11 @@
     "UserEventType": {
       "description": "User event",
       "type": "string",
+      "enum": [
+        "Entering",
+        "Leaving",
+        "Transferring"
+      ],
       "example": "Entering"
     },
     "UserInfo": {
diff --git a/LocationAPI.yaml b/LocationAPI.yaml
index df8d942ac55e3c61ac31d23b8accd2ad6544e3de..babead0540923becbb8f76cccf1b9dcc6c1b7d1b 100644
--- a/LocationAPI.yaml
+++ b/LocationAPI.yaml
@@ -849,6 +849,10 @@ definitions:
   UserEventType:
     description: User event
     type: string
+    enum:
+      - Entering
+      - Leaving
+      - Transferring
     example: Entering
   UserInfo:
     description: A type containing user information.
diff --git a/definitions/UserEventType.yaml b/definitions/UserEventType.yaml
index 642f32ec9c6fb8a992764884335c7d9968c71d76..3d60773a0c9d8354f31af70cb56093751a3fd9fd 100644
--- a/definitions/UserEventType.yaml
+++ b/definitions/UserEventType.yaml
@@ -1,3 +1,7 @@
 description: User event
 type: string
+enum:
+  - Entering
+  - Leaving
+  - Transferring
 example: "Entering"
\ No newline at end of file