diff --git a/README.md b/README.md
index 132536b..ca1d8fc 100644
--- a/README.md
+++ b/README.md
@@ -21,6 +21,10 @@ Put the following in your `~/.config/sway/config`:
         # cause the program to omit network traffic stats.
         status_command $HOME/.config/sway/swaybar_info --netdev=enp7s0
 
+        # A "built-in" for "acpi -b" is available, and can be activated with the
+        # --acpi-builtin flag:
+        status_command $HOME/.config/sway/swaybar_info --acpi-builtin
+
         # One can use the "--regex-cmd=<cmd>[SPLIT]<args...>[SPLIT]<regex>" option like so:
         status_command $HOME/.config/sway/swaybar_info --regex-cmd="acpi[SPLIT]-b[SPLIT][0-9]+%.*"
         # This example gets battery info into the bar.