diff --git a/OpenPGP-Security.md b/OpenPGP-Security.md
index 36bc5a0..4bd7807 100644
--- a/OpenPGP-Security.md
+++ b/OpenPGP-Security.md
@@ -127,4 +127,5 @@ Studies have shown that password meters can indeed encourage the selection of be
 * http://blog.cryptographyengineering.com/2014/08/whats-matter-with-pgp.html (also https://news.ycombinator.com/item?id=8174143)
 * http://secushare.org/PGP
 * https://github.com/micahflee/trollwot
-* https://help.riseup.net/en/gpg-best-practices
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+* https://help.riseup.net/en/gpg-best-practices
+* http://erack.de/bookmarks/gnupg.html
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