diff --git a/doc/todo/Compile_error_with_GHC_prerelease.mdwn b/doc/todo/Compile_error_with_GHC_prerelease.mdwn
new file mode 100644
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@@ -0,0 +1,14 @@
+For various reasons we cannot use v8.0 (prereleases) yet,
+but GHC v7.11.20150407
+
+There was a compilation hiccup with polymorphic types. I corrected it in
+
+https://github.com/ggreif/git-annex/tree/patch-1
+
+The commit is
+
+https://github.com/ggreif/git-annex/commit/a0ddad8d395b5eb61d1e7e6fdcbfa766c05de3d4
+
+Cheers,
+
+   Gabor