Updates README on BORGER_REPO path availability

diff --git a/README.md b/README.md
index a1406055a08e1893e964f58376a17483336ce5cb..123e7a0b99c9b9513c1d92f7bb0645333b681def 100644 (file)
--- a/README.md
+++ b/README.md
@@ -44,6 +44,9 @@ Then run borger normally:
 
     borger my-disk
 
+Note that `BORGER_REPO` param assumes that the path is available. If this path represents
+a mountpoint for an external drive then you should mount it manually.
+
 # Optional config
 
 These include: