diff --git a/doc/intro.sgml b/doc/intro.sgml
index 8e5cc3585..fadc94e2d 100644
--- a/doc/intro.sgml
+++ b/doc/intro.sgml
@@ -458,11 +458,11 @@ controlled by many different types of input devices:
The tutorial files are different for GEOS. You will find them "next door," in
"cc65/samples/geos"; they are called "
-cl65 -O -t cbm-geos hello1.c apphello1.grc
+cl65 -O -t cbm-geos hello1.c hello1res.grc
Copy the resulting file "