diff --git a/grammars/latex-beamer.cson b/grammars/latex-beamer.cson
index b16c267..2124fb4 100644
--- a/grammars/latex-beamer.cson
+++ b/grammars/latex-beamer.cson
@@ -1,7 +1,7 @@
 'scopeName': 'text.tex.latex.beamer'
 'name': 'LaTeX Beamer'
-'fileTypes': []
-'firstLineMatch': '^\\\\documentclass(\\[.*\\])?\\{beamer\\}'
+'fileTypes': ['tex']
+'contentRegex': '^\\\\documentclass(\\[.*\\])?\\{beamer\\}'
 'patterns': [
   {
     'begin': '(\\\\use(?:color|font|inner|outer)?theme)(?:(\\[)([^\\]]*)(\\]))?(\\{)'