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diff --git a/src/docs/wrong_transmute.txt b/src/docs/wrong_transmute.txt
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+### What it does
+Checks for transmutes that can't ever be correct on any
+architecture.
+
+### Why is this bad?
+It's basically guaranteed to be undefined behavior.
+
+### Known problems
+When accessing C, users might want to store pointer
+sized objects in `extradata` arguments to save an allocation.
+
+### Example
+```
+let ptr: *const T = core::intrinsics::transmute('x')
+```
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