diff --git a/main.cpp b/main.cpp
index 5b6b66c..3bf1df9 100644
--- a/main.cpp
+++ b/main.cpp
@@ -43,7 +43,7 @@ void help()
 {
 	printf("-h       this help\n");
 	printf("-T t.bin load file as a binary tape file (like simh \"load\" command)\n");
-	printf("-R d.rk  load file as a RK05 disk device\n");
+	printf("-R d.rk  load file as an RK05 disk device\n");
 	printf("-p 123   set CPU start pointer to decimal(!) value\n");
 	printf("-b x     enable bootloader (build-in), parameter must be \"rk05\" or \"rl02\"\n");
 	printf("-n       ncurses UI\n");