diff --git a/xml/System.Security.Cryptography/AesCng.xml b/xml/System.Security.Cryptography/AesCng.xml
index 9cf5da016e7..6cfe996804e 100644
--- a/xml/System.Security.Cryptography/AesCng.xml
+++ b/xml/System.Security.Cryptography/AesCng.xml
@@ -631,7 +631,9 @@
         <remarks>
           <format type="text/markdown"><![CDATA[  
   
-## Remarks  
+## Remarks 
+ For AES, the legal key sizes are 128, 192, and 256 bits.
+
  If you've created the <xref:System.Security.Cryptography.AesCng> object using an existing persisted key and you set the value of the <xref:System.Security.Cryptography.AesCng.KeySize%2A> property,  the persisted key will no longer be used and an ephemeral key will be used instead. If you need to use the persisted key again, a new instance of <xref:System.Security.Cryptography.AesCng> class needs to be created.  
   
  ]]></format>
diff --git a/xml/System.Security.Cryptography/AesCryptoServiceProvider.xml b/xml/System.Security.Cryptography/AesCryptoServiceProvider.xml
index 4633726b58a..b0ec7dab852 100644
--- a/xml/System.Security.Cryptography/AesCryptoServiceProvider.xml
+++ b/xml/System.Security.Cryptography/AesCryptoServiceProvider.xml
@@ -679,7 +679,7 @@
           <format type="text/markdown"><![CDATA[  
   
 ## Remarks  
- The minimum size of the key is 128 bits, and the maximum size is 256 bits.  
+ For AES, the legal key sizes are 128, 192, and 256 bits.
   
  Changing the `KeySize` value resets the key and generates a new random key. This happens whenever the `KeySize` property setter is invoked (including when it's assigned the same value).