diff --git a/.travis.yml b/.travis.yml
index d1b926f..f0f118f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,16 @@
 # Disable sudo to speed up the build
 sudo: false
 
-# Set the build language to Python
+# multiple operating systems
+os:
+  - linux
+  - osx
+  - windows
+# clone depth
+git:
+  depth: 3
+
+  # Set the build language to Python
 language: python
 
 # Set the python version to 3.(6,7,8)