diff --git a/csharp/ql/src/Security Features/WeakEncryption.qhelp b/csharp/ql/src/Security Features/WeakEncryption.qhelp
index c67583b05e92..1749144ae8b9 100644
--- a/csharp/ql/src/Security Features/WeakEncryption.qhelp	
+++ b/csharp/ql/src/Security Features/WeakEncryption.qhelp	
@@ -7,7 +7,7 @@
 
 </overview>
 <recommendation>
-<p>You should switch to a more secure encryption algorithm, such as AES (Advanced Encryption Standard) and use a key length which is reasonable for the application for which it is being used.</p>
+<p>You should switch to a more secure encryption algorithm, such as AES (Advanced Encryption Standard) and use a key length which is reasonable for the application for which it is being used. Do not use the ECB encryption mode since it is vulnerable to replay and other attacks.</p>
 
 </recommendation>
 <example>