diff --git a/lib/ide-flow.coffee b/lib/ide-flow.coffee
index d3f927d..f8fd54b 100644
--- a/lib/ide-flow.coffee
+++ b/lib/ide-flow.coffee
@@ -22,6 +22,9 @@ module.exports =
     require './flow-autocomplete-provider'
 
   config:
+    checkAllFiles:
+      type: 'boolean'
+      default: false
     checkOnFileSave:
       type: 'boolean'
       default: true
diff --git a/lib/utils.coffee b/lib/utils.coffee
index 713acec..91c25ac 100644
--- a/lib/utils.coffee
+++ b/lib/utils.coffee
@@ -5,6 +5,8 @@ isFlowSource = (editor) ->
   fname = buffer.getUri()
   isFlow = false
   if path.extname(fname) in ['.js', '.jsx']
+    if atom.config.get('ide-flow.checkAllFiles')
+      isFlow = true
     if buffer.lineForRow(buffer.nextNonBlankRow -1)?.match(/\/\*/)
       buffer.scan /\/\*(.|\n)*?\*\//, (scan) =>
         isFlow = true if scan.matchText.match(/@flow/)