diff --git a/types/socket.io/index.d.ts b/types/socket.io/index.d.ts
index 2b5100abb2..6c12e444b0 100644
--- a/types/socket.io/index.d.ts
+++ b/types/socket.io/index.d.ts
@@ -696,6 +696,23 @@ declare namespace SocketIO {
 		query: any;
 	}
 
+	/**
+	 * The interface describing a room
+	 */
+	interface Room {
+		sockets: {[id: string]: boolean };
+		length: number;
+	}
+
+	/**
+	 * The interface describing a dictionary of rooms
+	 * Where room is the name of the room
+	 */
+
+	 interface Rooms {
+		[room: string]: Room;
+	 }
+
 	/**
 	 * The interface used when dealing with rooms etc
 	 */
@@ -708,9 +725,8 @@ declare namespace SocketIO {
 
 		/**
 		 * A dictionary of all the rooms that we have in this namespace
-		 * The rooms are made of a `sockets` key which is the dictionary of sockets per ID
 		 */
-		rooms: {[room: string]: {sockets: {[id: string]: boolean }, length: number }};
+		rooms: Rooms;
 
 		/**
 		 * A dictionary of all the socket ids that we're dealing with, and all