doc: add entry for AsyncHook class

HarshithaKP · MylesBorins · commit 3fa57ee0c28a · 2020-03-11T14:21:10.000-04:00
fixes: #31661 PR-URL: #31865 Fixes: #31661 Reviewed-By: Stephen Belanger <admin@stephenbelanger.com> Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de> Reviewed-By: James M Snell <jasnell@gmail.com>
diff --git a/doc/api/async_hooks.md b/doc/api/async_hooks.md
@@ -170,6 +170,11 @@ provided by AsyncHooks itself. The logging should then be skipped when
 it was the logging itself that caused AsyncHooks callback to call. By
 doing this the otherwise infinite recursion is broken.
 
+### Class: `AsyncHook`
+
+The class `AsyncHook` exposes an interface for tracking lifetime events
+of asynchronous operations.
+
 #### `asyncHook.enable()`
 
 * Returns: {AsyncHook} A reference to `asyncHook`.
