diff --git a/README.md b/README.md
index 5bc3774..2775c20 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ ECS Service Discovery for Prometheus
 ## Info
 This tool provides Prometheus service discovery for Docker containers running on AWS ECS. You can easily instrument your app using a Prometheus
 client and enable discovery adding an ENV variable at the Service Task Definition. Your container will then be added
-to the list of Prometheus targets to be scraped. Requires python2 and boto3. Works with Prometheus 2.x. It supports bridge, host, and awsvpc
+to the list of Prometheus targets to be scraped. Requires python2 or python3 and boto3. Works with Prometheus 2.x. It supports bridge, host and awsvpc
 network modes.
 
 ## Setup
diff --git a/discoverecs.py b/discoverecs.py
index 001fd77..69c9167 100644
--- a/discoverecs.py
+++ b/discoverecs.py
@@ -44,7 +44,7 @@ def log(message):
     print(message)
 
 def chunk_list(l, n):
-    return [l[i:i + n] for i in xrange(0, len(l), n)]
+    return [l[i:i + n] for i in range(0, len(l), n)]
 
 def dict_get(d, k, default):
     if k in d: