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diff --git a/src/tools/clippy/src/docs/single_char_pattern.txt b/src/tools/clippy/src/docs/single_char_pattern.txt
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+### What it does
+Checks for string methods that receive a single-character
+`str` as an argument, e.g., `_.split("x")`.
+
+### Why is this bad?
+Performing these methods using a `char` is faster than
+using a `str`.
+
+### Known problems
+Does not catch multi-byte unicode characters.
+
+### Example
+```
+_.split("x");
+```
+
+Use instead:
+```
+_.split('x');
+```
+\ No newline at end of file