diff --git a/Stackage-Server-FAQ.md b/Stackage-Server-FAQ.md
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@@ -1 +1,7 @@
-TBD
\ No newline at end of file
+# How do I use it with sandboxes?
+
+## hsenv
+
+With hsenv you can simply edit the `.cabal/config` file and replace
+the `remote-repo` line with the line indicated on the page of the
+snapshot you want to use.