Small README change

README.md

@@ -75,7 +75,7 @@ e.g.:
 ### In CP/M
 
 In the standard Digital Research CP/M 3 source code, all help pages are kept together in one
-file, HELP.DAT.
+file, ```HELP.DAT```.
 To create the help database (```HELP.HLP```), there are two ways in CP/M:
 
 Either use ```MINHLP.COM``` to create this file, but I could not find a .COM file of it and had