Update validation policy in README.md document to cover attrition of existing validation code.
diff --git a/README.md b/README.md
index ec54749..098450d 100644
--- a/README.md
+++ b/README.md
@@ -360,6 +360,11 @@
be mapped to functionality available within *Metal*. In that situation, it is important to provide feedback to
the application developer to that effect, by performing the necessary validation, and reporting an error.
+Currently, there is some excess *Vulkan* validation and error reporting code within **MoltenVK**, added before
+this guideline was introduced. You are encouraged to remove such code if you encounter it while performing other
+**MoltenVK** development. Do not remove validation and error reporting code that is covering a deviation in
+behavior from the *Vulkan* specification.
+
### Memory Management
