README.md in ebnf-1.1.0 vs README.md in ebnf-1.1.1

@@ -26,10 +26,10 @@
 ## Usage
 ### Parsing an LL(1) Grammar
 
     require 'ebnf'
 
-    ebnf = EBNF.parse(File.open(./etc/ebnf.bnf))
+    ebnf = EBNF.parse(File.open('./etc/ebnf.bnf'))
 
 Output rules and terminals as S-Expressions, Turtle or EBNF
 
     puts ebnf.to_sxp
     puts ebnf.to_ttl