diff --git a/js-implicit-popup/readme.md b/js-implicit-popup/readme.md
index 4ae798d..ee50817 100644
--- a/js-implicit-popup/readme.md
+++ b/js-implicit-popup/readme.md
@@ -12,7 +12,8 @@ The start_page.html contains a simple form.
 To test locally
 ---------------
 - start a webserver in this directory
-  - use `python -m SimpleHTTPServer 8080` or
+  - Python2: use `python -m SimpleHTTPServer 8080` or
+  - Python3: use `python3 -m http.server 8080` or
   - use `http-server` (`npm install http-server -g` to install)
 - visit http://localhost:8080/start_page.html
 - test
@@ -32,4 +33,4 @@ Notes
 -----
 
 - The example uses bootstrap to make itself pretty.  This is not required to make it work.
-- This can be done without the popup with a simple redirect (see the js-orcid-jwt example).
\ No newline at end of file
+- This can be done without the popup with a simple redirect (see the js-orcid-jwt example).