diff --git a/src/packages/log4net.2.0.0/lib/net40-full/custom-build-readme.txt b/src/packages/log4net.2.0.0/lib/net40-full/custom-build-readme.txt
index e69de29bb2..bf65cca6eb 100644
--- a/src/packages/log4net.2.0.0/lib/net40-full/custom-build-readme.txt
+++ b/src/packages/log4net.2.0.0/lib/net40-full/custom-build-readme.txt
@@ -0,0 +1,4 @@
+the shipped Log4Net doesn't work in medium trust. 
+
+we've had to rebuild the solution to make it work following these instructions:
+http://stackoverflow.com/questions/9700625/c-sharp-webapp-log4net-partial-trust-high-or-medium-not-working
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