--- a/mobile/android/docs/mma.rst
+++ b/mobile/android/docs/mma.rst
@@ -135,16 +135,20 @@ List of current Events related data that
 * When a screenshot is taken
 {
   "event" : "E_Screenshot"
 }
 * Open a new tab
 {
   "event" : "E_Opened_New_Tab"
 }
+* Sign In Firefox Account
+{
+  "event" : "E_User_Signed_In_To_FxA"
+}
 
 Deep Links:
 Deep links are actions that can point Fennec to open certain pages or load features such as `show bookmark list` or
 `open a SUMO page`. When users see a prompt Leanplum message, they can click the button(s) on it. These buttons can
 trigger the following deep links
 * Link to Set Default Browser settings (firefox://default_browser)
 * Link to specific Add-on page (http://link_to_the_add_on_page)
 * Link to sync signup/sign in (firefox://sign_up)