1 files changed, 5 insertions, 1 deletions
diff --git a/src/block/rc5/rc5.h b/src/block/rc5/rc5.h
index 5135336b1..385c6b2b1 100644
--- a/src/block/rc5/rc5.h
+++ b/src/block/rc5/rc5.h
@@ -25,7 +25,11 @@ class BOTAN_DLL RC5 : public BlockCipher
       std::string name() const;
       BlockCipher* clone() const { return new RC5(ROUNDS); }
 
-      RC5(u32bit);
+      /**
+      * @param rounds the number of RC5 rounds to run. Must be between
+      * 8 and 32 and a multiple of 4.
+      */
+      RC5(u32bit rounds);
    private:
       void key_schedule(const byte[], u32bit);
       SecureVector<u32bit> S;