diff --git a/programs/pkey/dh_genprime.c b/programs/pkey/dh_genprime.c
index fc37f5c..94f1c62 100644
--- a/programs/pkey/dh_genprime.c
+++ b/programs/pkey/dh_genprime.c
@@ -1,7 +1,7 @@
 /*
  *  Diffie-Hellman-Merkle key exchange (prime generation)
  *
- *  Copyright (C) 2006-2011, Brainspark B.V.
+ *  Copyright (C) 2006-2012, Brainspark B.V.
  *
  *  This file is part of PolarSSL (http://www.polarssl.org)
  *  Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
@@ -71,6 +71,13 @@
     mpi_init( &G ); mpi_init( &P ); mpi_init( &Q );
     mpi_read_string( &G, 10, GENERATOR );
 
+    printf( "\nWARNING: You should not generate and use your own DHM primes\n" );
+    printf( "         unless you are very certain of what you are doing!\n" );
+    printf( "         Failing to follow this instruction may result in\n" );
+    printf( "         weak security for your connections! Use the\n" );
+    printf( "         predefined DHM parameters from dhm.h instead!\n\n" );
+    printf( "============================================================\n\n" );
+
     printf( "\n  . Seeding the random number generator..." );
     fflush( stdout );