diff --git a/include/polarssl/arc4.h b/include/polarssl/arc4.h
index c6c676b..555f54f 100644
--- a/include/polarssl/arc4.h
+++ b/include/polarssl/arc4.h
@@ -55,9 +55,23 @@
 arc4_context;
 
 /**
- * \brief          ARC4 key schedule
+ * \brief          Initialize ARC4 context
  *
  * \param ctx      ARC4 context to be initialized
+ */
+void arc4_init( arc4_context *ctx );
+
+/**
+ * \brief          Clear ARC4 context
+ *
+ * \param ctx      ARC4 context to be cleared
+ */
+void arc4_free( arc4_context *ctx );
+
+/**
+ * \brief          ARC4 key schedule
+ *
+ * \param ctx      ARC4 context to be setup
  * \param key      the secret key
  * \param keylen   length of the key, in bytes
  */