--- a/progs/README	Tue Oct 04 17:10:01 2016 +0100
+++ b/progs/README	Tue Oct 04 22:43:00 2016 +0100
@@ -19,6 +19,7 @@
 
   emacs -nw ...file....     (is also an alias)
 
+  gcc -O file file.c
 
 C0.c
 ====