diff --git a/README.md b/README.md
index f4ab98e..c76ab4e 100644
--- a/README.md
+++ b/README.md
@@ -41,7 +41,7 @@ API documentation is available [here](https://bitchan.github.io/bitmessage/docs/
   - [x] verack
   - [x] addr
   - [x] inv
-  - [ ] getdata
+  - [x] getdata
   - [ ] error
   - [ ] object
 - [ ] Object types
@@ -58,10 +58,10 @@ API documentation is available [here](https://bitchan.github.io/bitmessage/docs/
     - [x] getRipe
     - [x] fromRandom
     - [ ] fromPassphrase
-  - [x] UserAgent
   - [ ] Message
     - [ ] encrypt
     - [ ] decrypt
+  - [x] UserAgent
 - [ ] Parse PyBitmessage configs
   - [ ] keys.dat
   - [ ] knownnodes.dat
diff --git a/lib/messages.js b/lib/messages.js
index f738caf..8762e60 100644
--- a/lib/messages.js
+++ b/lib/messages.js
@@ -144,8 +144,9 @@ exports.addr = {
  * more objects.
  * @see {@link https://bitmessage.org/wiki/Protocol_specification#inv}
  * @namespace
+ * @static
  */
-exports.inv = {
+var inv = exports.inv = {
   /**
    * Decode `inv` payload.
    * @param {Buffer} buf - Buffer that starts with encoded `inv` payload
@@ -180,3 +181,12 @@ exports.inv = {
     return Buffer.concat([structs.var_int.encode(inventory.length), invBuf]);
   },
 };
+
+/**
+ * `getdata` message. `getdata` is used in response to an `inv` message
+ * to retrieve the content of a specific object after filtering known
+ * elements.
+ * @see {@link https://bitmessage.org/wiki/Protocol_specification#getdata}
+ * @namespace
+ */
+exports.getdata = inv;