diff --git a/README.md b/README.md
index 92b3585..a4f49cf 100755
--- a/README.md
+++ b/README.md
@@ -263,12 +263,15 @@ to something similar to "http://domain/#channel/2011-03-09 14:25:09", or
 
     Device or target name for push notifications.
 
-    When using Pushover, this option allows you to specify a single device name to send
-    notifications to; if blank or unset, notifications will be sent to all devices.
+    When using Pushover or PushBullet, this option allows you to specify a
+    single device to send notifications to; if blank or unset, notifications
+    will be sent to all devices.  For Pushover, this is the device name; for
+    PushBullet, this is the device_iden.
 
-    When using Nexmo, this option allows you to specify the SMS destination number. The number must be in international format.
+    When using Nexmo, this option allows you to specify the SMS destination
+    number. The number must be in international format.
 
-    This option must be set when using PushBullet and Airgram. This module supports both `device_id` (older, numeric id) and the `device_iden` (newer, alphanumeric id) used by PushBullet. You can find your `device_iden` by navigating to a device page and noting the last part of the URL. When using Airgram, this is the email address of the end user.
+    When using Airgram, this is the email address of the end user.
 
 
 ### Notifications