diff --git a/src/main/java/org/example/tampoposerverdtram/resources/ChatRooms.java b/src/main/java/org/example/tampoposerverdtram/resources/ChatRooms.java
index 0e04dd8..0dc1498 100644
--- a/src/main/java/org/example/tampoposerverdtram/resources/ChatRooms.java
+++ b/src/main/java/org/example/tampoposerverdtram/resources/ChatRooms.java
@@ -80,4 +80,19 @@
 		Entity<Form> entity = Entity.entity(form, MediaType.APPLICATION_FORM_URLENCODED);
 		String result = client.target("http://localhost:8080").path("/roomId").request().post(entity, String.class);
 	}
+	@Path("/{chatRoomId}")
+	@POST
+	public void addChatRoomMember(@PathParam("chatRoomId") String chatRoomId, @FormParam("userId") String userId) {
+		Map<String, Map<String, Object>> users_json = client.target("http://localhost:8080").path("/users").request().get(HashMap.class);
+		Map<String, Map<String, Object>> users = new HashMap<>();
+		users = users_json;
+		Map<String, String> temp_if28;
+		if (users.containsKey(userId)) {
+			temp_if28 = this.value.get(chatRoomId);
+			temp_if28.put(userId,null);
+		} else {
+			temp_if28 = this.value.get(chatRoomId);
+		}
+		this.value.put(chatRoomId,temp_if28);
+	}
 }
\ No newline at end of file