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-rw-r--r--doc/help.txt8
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diff --git a/doc/help.txt b/doc/help.txt
index a3322ee67..c4cc3d11a 100644
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+++ b/doc/help.txt
@@ -135,7 +135,13 @@ Please consult your security expert first.
.gpg.keygen.size
-Enter the size of the key.
+Enter the size of the key.
+
+The suggested default is usually a good choice.
+
+If you want to use a large key size, for example 4096 bit, please
+think again whether it really makes sense for you. You may want
+to view the web page http://www.xkcd.com/538/ .
.
.gpg.keygen.size.huge.okay