diff --git a/README.md b/README.md
index 7610325..d3aeae1 100644
--- a/README.md
+++ b/README.md
@@ -28,7 +28,7 @@ The approach is as follows:
    has finished running, check if the buffer has been modified since
    it started; only apply the changes if not.
 2. After running the code formatter, generate an [RCS
-   patch](https://tools.ietf.org/doc/tcllib/html/rcs.html#section4)
+   patch](https://web.archive.org/web/20220527003730/https://tools.ietf.org/doc/tcllib/html/rcs.html#section4)
    showing the changes and then apply it to the buffer. This prevents
    changes elsewhere in the buffer from moving point. If a patch
    region happens to include point, then use a [dynamic programming
diff --git a/apheleia-rcs.el b/apheleia-rcs.el
index e462921..7b54573 100644
--- a/apheleia-rcs.el
+++ b/apheleia-rcs.el
@@ -25,7 +25,8 @@ the following keys:
 - `lines': number of lines to be inserted or removed
 - `text': the string to be inserted, only for `addition'
 
-See <https://tools.ietf.org/doc/tcllib/html/rcs.html#section4>
+See
+<https://web.archive.org/web/20220527003730/https://tools.ietf.org/doc/tcllib/html/rcs.html#section4>
 for documentation on the RCS patch format."
   (save-excursion
     (goto-char (point-min))
@@ -206,3 +207,7 @@ contains the patch."
 (provide 'apheleia-rcs)
 
 ;;; apheleia-rcs.el ends here
+
+;; Local Variables:
+;; byte-compile-docstring-max-column: 160
+;; End: