Clarify documentation of Kernel#require_relative

load.c

@@ -945,9 +945,10 @@ rb_f_require(VALUE obj, VALUE fname)
  * call-seq:
  *   require_relative(string) -> true or false
  *
- * Ruby tries to load the library named _string_ relative to the requiring
- * file's path.  If the file's path cannot be determined a LoadError is raised.
- * If a file is loaded +true+ is returned and false otherwise.
+ * Ruby tries to load the library named _string_ relative to the directory
+ * containing the requiring file.  If the file does not exist a LoadError is
+ * raised. Returns +true+ if the file was loaded and +false+ if the file was
+ * already loaded before.
  */
 VALUE
 rb_f_require_relative(VALUE obj, VALUE fname)