diff --git a/doc/readme.md b/doc/readme.md
index 9b1349d..75a9891 100644
--- a/doc/readme.md
+++ b/doc/readme.md
@@ -44,9 +44,13 @@
 
 ### Viewing
 ```
-pushd build/html && python -m SimpleHTTPServer 3000  
+# python 2
+pushd build/html && python -m SimpleHTTPServer 3000 
+
+# python 3
+pushd build/html && python -m http.server 3000 
 ```
 
 ### Screenshot
 
-<img src="https://user-images.githubusercontent.com/1182522/48395569-04995d00-e75b-11e8-87b8-2f28662ef3ca.png">
\ No newline at end of file
+<img src="https://user-images.githubusercontent.com/1182522/48395569-04995d00-e75b-11e8-87b8-2f28662ef3ca.png">