diff --git a/mongodb/mongodb.d.ts b/mongodb/mongodb.d.ts
index 0805e832a..01b31e538 100644
--- a/mongodb/mongodb.d.ts
+++ b/mongodb/mongodb.d.ts
@@ -129,6 +129,26 @@ declare module "mongodb" {
     public static createFromHexString(hexString: string): ObjectID;
   }
 
+  // Class documentation : http://mongodb.github.io/node-mongodb-native/api-bson-generated/binary.html
+  export class Binary {
+    constructor (buffer: Buffer, subType?: number);
+
+    // Updates this binary with byte_value
+    put(byte_value: any): void;
+
+    // Writes a buffer or string to the binary
+    write(buffer: any, offset: number): void;
+
+    // Reads length bytes starting at position.
+    read(position: number, length: number): Buffer;
+
+    // Returns the value of this binary as a string.
+    value(): string;
+
+    // The length of the binary.
+    length(): number;
+  }
+
   export interface SocketOptions {
     //= set seconds before connection times out default:0
     timeout?: number;