diff --git a/doc/config.md b/doc/config.md
index dec554cd..ad21926e 100644
--- a/doc/config.md
+++ b/doc/config.md
@@ -918,10 +918,13 @@ configurable with the following options:
     `post:script` action with exit code `crashed`, see below
   * `reload:script [args]` -- some services do not support `SIGHUP` but
     may have other ways to update the configuration of a running daemon.
-    When `reload:script` is defined it is preferred over `SIGHUP`
+    When `reload:script` is defined it is preferred over `SIGHUP`.  Like
+	systemd, Finit sets `$MAINPID` as a convenience to scripts, which in
+	effect also allow `reload:kill -HUP $MAINPID`
   * `stop:script [args]` -- some services may require alternate methods
     to be stopped.  When `stop:script` is defined it is preferred over
-    `SIGTERM` and `stop`, for `service` and `sysv` stanzas, respectively
+    `SIGTERM` and `stop` for `service` and `sysv` stanzas, respectively.
+	Similar to `reload:script`, Finit sets `$MAINPID`
 
 > [!CAUTION]
 > Both `reload:script` and `stop:script` are called as PID 1, without