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diff --git a/toolkit/components/telemetry/docs/concepts/crashes.rst b/toolkit/components/telemetry/docs/concepts/crashes.rst
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+=======
+Crashes
+=======
+
+There are many different kinds of crashes for Firefox, there is not a single system used to record all of them.
+
+Main process crashes
+====================
+
+If the Firefox main process dies, that should be recorded as an aborted session. We would submit a :doc:`main ping <../data/main-ping>` with the reason ``aborted-session``.
+If we have a crash dump for that crash, we should also submit a :doc:`crash ping <../data/crash-ping>`.
+
+The ``aborted-session`` information is first written to disk 60 seconds after startup, any earlier crashes will not trigger an ``aborted-session`` ping.
+Also, the ``aborted-session`` is updated at least every 5 minutes, so it may lag behind the last session state.
+
+Crashes during startup should be recorded in the next sessions main ping in the ``STARTUP_CRASH_DETECTED`` histogram.
+
+Child process crashes
+=====================
+
+If a Firefox plugin, content or gmplugin process dies unexpectedly, this is recorded in the main pings ``SUBPROCESS_ABNORMAL_ABORT`` keyed histogram.
+
+If we catch a crash report for this, then additionally the ``SUBPROCESS_CRASHES_WITH_DUMP`` keyed histogram is incremented.