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diff --git a/src/tools/clippy/src/docs/duration_subsec.txt b/src/tools/clippy/src/docs/duration_subsec.txt
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+### What it does
+Checks for calculation of subsecond microseconds or milliseconds
+from other `Duration` methods.
+
+### Why is this bad?
+It's more concise to call `Duration::subsec_micros()` or
+`Duration::subsec_millis()` than to calculate them.
+
+### Example
+```
+let micros = duration.subsec_nanos() / 1_000;
+let millis = duration.subsec_nanos() / 1_000_000;
+```
+
+Use instead:
+```
+let micros = duration.subsec_micros();
+let millis = duration.subsec_millis();
+```
+\ No newline at end of file