diff --git a/src/openpgp.js b/src/openpgp.js
index aec0f9c4..b027991e 100644
--- a/src/openpgp.js
+++ b/src/openpgp.js
@@ -117,7 +117,6 @@ export function generateKey({ userIds=[], passphrase, numBits=2048, unlocked=fal
  * Generates a new OpenPGP key pair. Currently only supports RSA keys. Primary and subkey will be of same type.
  * @param  {Array<Object>} userIds   array of user IDs e.g. [{ name:'Phil Zimmermann', email:'phil@openpgp.org' }]
  * @param  {String} passphrase       (optional) The passphrase used to encrypt the resulting private key
- * @param  {Number} numBits          (optional) number of bits for the key creation. (should be 2048 or 4096)
  * @param  {Boolean} unlocked        (optional) If the returned secret part of the generated key is unlocked
  * @param  {Number} keyExpirationTime (optional) The number of seconds after the key creation time that the key expires
  * @return {Promise<Object>}         The generated key object in the form: