diff --git a/bin/convert.c b/bin/convert.c
index 9720a63..e58c754 100644
--- a/bin/convert.c
+++ b/bin/convert.c
@@ -11,7 +11,7 @@
 #include <hexagram/pcapng.h>
 
 char *hexagram_arglist_convert(void) {
-    return "[infile] [outfile]";
+    return "[infile.pcapng] [outfile.can]";
 }
 
 static ssize_t handle_option(hexagram_pcapng_stream *stream,