diff --git a/doc/todo/windows_support.mdwn b/doc/todo/windows_support.mdwn
index 200f8cea5c..bd71f3f6f3 100644
--- a/doc/todo/windows_support.mdwn
+++ b/doc/todo/windows_support.mdwn
@@ -8,6 +8,9 @@ now! --[[Joey]]
   (When Cygwin's build of git is used to make the clone, it puts the
   slashes the other way around in .git/config, which also doesn't work
   for git-annex.)
+* Does not work with Cygwin's build of git (that git does not consistently
+  support use of DOS style paths, which git-annex uses on Windows).
+  Must use the upstream build of git for Windows.
 * test suite doesn't work
 * Bad file locking, it's probably not safe to run more than one git-annex
   process at the same time on Windows.