diff --git a/.swfit-version b/.swfit-version
new file mode 100644
index 0000000..5186d07
--- /dev/null
+++ b/.swfit-version
@@ -0,0 +1 @@
+4.0
diff --git a/iOSCharts.podspec b/iOSCharts.podspec
index 1bc5c10..1f9088b 100644
--- a/iOSCharts.podspec
+++ b/iOSCharts.podspec
@@ -8,5 +8,5 @@ Pod::Spec.new do |s|
   s.author       = "3Pillar Global"
   s.platform     = :ios, "8.0"
   s.source       = { :git => "https://github.com/3pillarlabs/ios-charts.git", :tag => "#{s.version}" }
-  s.source_files = "Sources/*"
+  s.source_files = "Sources/**/*.{h,m,swift}"
 end