doc update

diff --git a/doc/cha-crypto.texi b/doc/cha-crypto.texi
index 83701ccfa88d1199ca9bd685e9fcde60a76ceaf9..8c92deb116a6fc38c012c29ee9c548156744ccf2 100644 (file)
--- a/doc/cha-crypto.texi
+++ b/doc/cha-crypto.texi
@@ -35,7 +35,9 @@ functions are provided to set the associated data and retrieve the authenticatio
 @cindex public key algorithms
 
 Public key cryptography algorithms such as RSA, DSA and ECDSA, can be
-accessed using the abstract key API in @ref{Abstract key types}.
+accessed using the abstract key API in @ref{Abstract key types}. This
+is a high level API with the advantage of transparently handling keys
+in memory and keys present in smart cards.
 
 @node Hash and HMAC functions
 @section Hash and HMAC functions