diff --git a/libtelnet.h b/libtelnet.h
index 843b76b..87f0659 100644
--- a/libtelnet.h
+++ b/libtelnet.h
@@ -190,4 +190,8 @@
 		unsigned char opt, unsigned char *buffer, unsigned int size,
 		void *user_data);
 
+/* begin sending compressed data (server only) */
+extern void libtelnet_begin_compress2(struct libtelnet_t *telnet,
+		void *user_data);
+
 #endif /* !defined(LIBTELNET_INCLUDE) */