diff --git a/string.c b/string.c
index b1dccce4ef9690..3254ea28b65253 100644
--- a/string.c
+++ b/string.c
@@ -8146,19 +8146,12 @@ downcase_single(VALUE str)
* call-seq:
* downcase!(mapping) -> self or nil
*
- * Downcases the characters in +self+;
- * returns +self+ if any changes were made, +nil+ otherwise:
- *
- * s = 'Hello World!' # => "Hello World!"
- * s.downcase! # => "hello world!"
- * s # => "hello world!"
- * s.downcase! # => nil
+ * Like String#downcase, except that:
*
- * The casing may be affected by the given +mapping+;
- * see {Case Mapping}[rdoc-ref:case_mapping.rdoc].
- *
- * Related: String#downcase, String#upcase, String#upcase!.
+ * - Changes character casings in +self+ (not in a copy of +self+).
+ * - Returns +self+ if any changes are made, +nil+ otherwise.
*
+ * Related: See {Modifying}[rdoc-ref:String@Modifying].
*/
static VALUE
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