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diff --git a/src/tools/clippy/src/docs/unnecessary_mut_passed.txt b/src/tools/clippy/src/docs/unnecessary_mut_passed.txt
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+++ b/src/tools/clippy/src/docs/unnecessary_mut_passed.txt
@@ -0,0 +1,17 @@
+### What it does
+Detects passing a mutable reference to a function that only
+requires an immutable reference.
+
+### Why is this bad?
+The mutable reference rules out all other references to
+the value. Also the code misleads about the intent of the call site.
+
+### Example
+```
+vec.push(&mut value);
+```
+
+Use instead:
+```
+vec.push(&value);
+```
+\ No newline at end of file