diff --git a/README.md b/README.md
index 5ab93c6..10c822f 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,8 @@ When trying to open the app for the first time, Gatekeeper will prevent you from
 
 After setting a charge limit, the app will silently run and reapply the desired charge level again if you restart your Mac. If you wish to fully charge the battery again, set the charge limit to "100". This will also remove the charge limit persistency on boot. Afterwards, if you do not need the app anymore you can safely move it to the trash.
 
+If you are running macOS High Sierra (10.13) or older, you may need to install [Swift 5 Runtime Support](https://support.apple.com/kb/dl1998?locale=en_US).
+
 ## Updates
 
 This app will automatically check and notify you for any updates when you run it.