diff --git a/firstapp/samples/libcloud/introduction.py b/firstapp/samples/libcloud/introduction.py
index 8e80d528b..c3e81c47e 100644
--- a/firstapp/samples/libcloud/introduction.py
+++ b/firstapp/samples/libcloud/introduction.py
@@ -51,10 +51,10 @@ unused_floating_ip = pool.create_floating_ip()
 conn.ex_attach_floating_ip_to_node(instance, unused_floating_ip)
 
 # step-11
-worker_group = conn.ex_create_security_group('worker', 'for services that run on a worker note')
+worker_group = conn.ex_create_security_group('worker', 'for services that run on a worker node')
 conn.ex_create_security_group_rule(worker_group, 'TCP', 22, 22)
 
-controller_group = conn.ex_create_security_group('control', 'for services that run on a control note')
+controller_group = conn.ex_create_security_group('control', 'for services that run on a control node')
 conn.ex_create_security_group_rule(controller_group, 'TCP', 22, 22)
 conn.ex_create_security_group_rule(controller_group, 'TCP', 80, 80)
 conn.ex_create_security_group_rule(controller_group, 'TCP', 5672, 5672, source_security_group=worker_group)
diff --git a/firstapp/samples/libcloud/scaling_out.py b/firstapp/samples/libcloud/scaling_out.py
index 7e2958dae..297955ce1 100644
--- a/firstapp/samples/libcloud/scaling_out.py
+++ b/firstapp/samples/libcloud/scaling_out.py
@@ -15,10 +15,10 @@ api_group = conn.ex_create_security_group('api', 'for API services only')
 conn.ex_create_security_group_rule(api_group, 'TCP', 80, 80)
 conn.ex_create_security_group_rule(api_group, 'TCP', 22, 22)
 
-worker_group = conn.ex_create_security_group('worker', 'for services that run on a worker note')
+worker_group = conn.ex_create_security_group('worker', 'for services that run on a worker node')
 conn.ex_create_security_group_rule(worker_group, 'TCP', 22, 22)
 
-controller_group = conn.ex_create_security_group('control', 'for services that run on a control note')
+controller_group = conn.ex_create_security_group('control', 'for services that run on a control node')
 conn.ex_create_security_group_rule(controller_group, 'TCP', 22, 22)
 conn.ex_create_security_group_rule(controller_group, 'TCP', 80, 80)
 conn.ex_create_security_group_rule(controller_group, 'TCP', 5672, 5672, source_security_group=worker_group)