diff --git a/doc/forum/two_lines_back_to_remote__63__.mdwn b/doc/forum/two_lines_back_to_remote__63__.mdwn
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@@ -0,0 +1,12 @@
+`git annex map` generates a diagram roughly like this:
+
+```
++------+    +-------+
+|laptop| -> |usbdisk|
+|      | <- |       |
+|      | <- |       |
++------+    +-------+
+```
+
+Why are there *two* lines back from the disk to the laptop?
+