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diff --git a/src/tools/clippy/src/docs/unnecessary_cast.txt b/src/tools/clippy/src/docs/unnecessary_cast.txt
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+### What it does
+Checks for casts to the same type, casts of int literals to integer types
+and casts of float literals to float types.
+
+### Why is this bad?
+It's just unnecessary.
+
+### Example
+```
+let _ = 2i32 as i32;
+let _ = 0.5 as f32;
+```
+
+Better:
+
+```
+let _ = 2_i32;
+let _ = 0.5_f32;
+```
+\ No newline at end of file