diff --git a/lib/structs.js b/lib/structs.js
index 71ee642..6ce66bb 100644
--- a/lib/structs.js
+++ b/lib/structs.js
@@ -992,6 +992,22 @@ var ServicesBitfield = exports.ServicesBitfield = objectAssign(Bitfield(64), {
    * @constant {number}
    */
   NODE_NETWORK: 63,
+  /**
+   * Bit index indicating web/mobile client with limited network
+   * capabilities (proposal feature).
+   * @memberof module:bitmessage/structs.ServicesBitfield
+   * @see {@link https://bitmessage.org/wiki/Mobile_Protocol_specification}
+   * @constant {number}
+   */
+  NODE_MOBILE: 62,
+  /**
+   * Bit index indicating node which can work as a WebSocket gateway for
+   * web/mobile clients (proposal feature).
+   * @memberof module:bitmessage/structs.ServicesBitfield
+   * @see {@link https://bitmessage.org/wiki/Mobile_Protocol_specification}
+   * @constant {number}
+   */
+  NODE_GATEWAY: 61,
 });
 
 /**
@@ -1035,6 +1051,14 @@ exports.PubkeyBitfield = objectAssign(Bitfield(32), {
    * @memberof module:bitmessage/structs.PubkeyBitfield
    */
 
+  /**
+   * Bit index.
+   * If set, the receiving node does send acknowledgements (rather than
+   * dropping them).
+   * @memberof module:bitmessage/structs.PubkeyBitfield
+   * @constant {number}
+   */
+  DOES_ACK: 31,
   /**
    * Bit index.
    * If set, the receiving node expects that the RIPEMD hash encoded in
@@ -1044,12 +1068,4 @@ exports.PubkeyBitfield = objectAssign(Bitfield(32), {
    * @constant {number}
    */
   INCLUDE_DESTINATION: 30,
-  /**
-   * Bit index.
-   * If set, the receiving node does send acknowledgements (rather than
-   * dropping them).
-   * @memberof module:bitmessage/structs.PubkeyBitfield
-   * @constant {number}
-   */
-  DOES_ACK: 31,
 });