Use proper doxygen markup to mark deprecations
diff --git a/library/cipher.c b/library/cipher.c
index 8c7452b..516fa00 100644
--- a/library/cipher.c
+++ b/library/cipher.c
@@ -165,7 +165,7 @@
     return( 0 );
 }
 
-/* Deprecated, redirects to cipher_free() */
+/* compatibility wrapper */
 int cipher_free_ctx( cipher_context_t *ctx )
 {
     cipher_free( ctx );