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diff --git a/src/tools/clippy/src/docs/cast_nan_to_int.txt b/src/tools/clippy/src/docs/cast_nan_to_int.txt
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+++ b/src/tools/clippy/src/docs/cast_nan_to_int.txt
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+### What it does
+Checks for a known NaN float being cast to an integer
+
+### Why is this bad?
+NaNs are cast into zero, so one could simply use this and make the
+code more readable. The lint could also hint at a programmer error.
+
+### Example
+```
+let _: (0.0_f32 / 0.0) as u64;
+```
+Use instead:
+```
+let _: = 0_u64;
+```
+\ No newline at end of file