diff --git a/readme.md b/readme.md
index cf5b9776..57db9caf 100644
--- a/readme.md
+++ b/readme.md
@@ -6,4 +6,5 @@
 калибровочных клейм.
 
 
-[PostScript]: https://ru.wikipedia.org/wiki/PostScript
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+[PostScript]: https://ru.wikipedia.org/wiki/PostScript
+[PostScript Language reference manual]: http://wwwimages.adobe.com/content/dam/Adobe/en/devnet/postscript/pdfs/psrefman.pdf
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