diff --git a/docs/README b/docs/README
index 4faf088..a6b9103 100644
--- a/docs/README
+++ b/docs/README
@@ -58,6 +58,6 @@ Hooking scripts:
         #!/bin/bash -e
         target=/vol
         mountp=$(dirname $(dirname $0))
-        ln -sf $mountp $target
+        [ ! -h $target ] && ln -s $mountp $target