README typo

diff --git a/README.md b/README.md
index df6e1c6d76d9706803e7173ca82fdc62af3c5ac4..deb92560157f3152239a5f5a1a3deb6389407dc6 100644 (file)
--- a/README.md
+++ b/README.md
@@ -29,7 +29,7 @@ using the pdf.js API.
 
 ### Extension
 
-A up-to-date Firefox extension is also available:
+An up-to-date Firefox extension is also available:
 
 + http://mozilla.github.com/pdf.js/extensions/firefox/pdf.js.xpi