diff --git a/docs/ref/settings.txt b/docs/ref/settings.txt
index 32a115299a..5503d8752d 100644
--- a/docs/ref/settings.txt
+++ b/docs/ref/settings.txt
@@ -2579,6 +2579,9 @@ your additional files directory(ies) e.g.::
         "/opt/webfiles/common",
     )
 
+Note that these paths should use Unix-style forward slashes, even on Windows
+(e.g. ``"C:/Users/user/mysite/extra_static_content"``).
+
 Prefixes (optional)
 ~~~~~~~~~~~~~~~~~~~