diff --git a/MANUAL.txt b/MANUAL.txt
index 8904f0dc5..933a5e8f1 100644
--- a/MANUAL.txt
+++ b/MANUAL.txt
@@ -102,7 +102,7 @@ Markdown can be expected to be lossy.
 [PDF]: https://www.adobe.com/pdf/
 [reveal.js]: http://lab.hakim.se/reveal-js/
 [FictionBook2]: http://www.fictionbook.org/index.php/Eng:XML_Schema_Fictionbook_2.1
-[InDesign ICML]: https://www.adobe.com/content/dam/Adobe/en/devnet/indesign/cs55-docs/IDML/idml-specification.pdf
+[InDesign ICML]: http://wwwimages.adobe.com/www.adobe.com/content/dam/acom/en/devnet/indesign/sdk/cs6/idml/idml-cookbook.pdf
 [TEI Simple]: https://github.com/TEIC/TEI-Simple
 [Muse]: https://amusewiki.org/library/manual
 [PowerPoint]: https://en.wikipedia.org/wiki/Microsoft_PowerPoint