diff --git a/README.md b/README.md
index ce9b331..7e17977 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,15 @@
+IMPORTANT
+=========
+Crucial bug fixed in Fay and Wu's calculation.
+
+If you have a old Forked version of selectionTools, you will need to update to the latest version on the master branch.
+
+In your repo run the following command.
+```bash
+    git pull origin master 
+```
+Your version needs to be more recent that the commit dd6ceb045ea6f2a3f4ee2585416ea31cf2020049
+
 selectionTools 1.0
 =========================
 Pipeline to take VCF through to Selection Analysis.