diff --git a/Mount-on-Windows.md b/Mount-on-Windows.md
index 507321d..bc4af5d 100644
--- a/Mount-on-Windows.md
+++ b/Mount-on-Windows.md
@@ -71,7 +71,7 @@ Entries whose names Windows cannot represent are invisible from a Windows mount,
 
 ### Troubleshooting
 
-**"WinFsp refused to mount S:"** — WinFsp is not installed, the drive letter is taken, or the mount point already exists. `net use` lists the drive letters in use.
+**"WinFsp refused to mount S:"** — WinFsp is not installed, the drive letter is taken, or the directory being mounted over is not empty. `net use` lists the drive letters in use.
 
 **The mount exits reporting it cannot reach the filer** — check the filer's gRPC port, which is its HTTP port plus 10000 (`8888` → `18888`). It is the gRPC port the mount dials, so a filer answering on HTTP is not proof it is reachable. Use `127.0.0.1` rather than `localhost`.