diff --git a/app/sms.py b/app/sms.py
index 82324bd..e35e08b 100644
--- a/app/sms.py
+++ b/app/sms.py
@@ -14,7 +14,7 @@ pin = os.environ['PIN']
 
 PIN_ENTER_TEMPLATE = '''<request>
     <OperateType>0</OperateType>
-    <CurrentPin>''' + PIN + '''</CurrentPin>
+    <CurrentPin>''' + pin + '''</CurrentPin>
     <NewPin></NewPin>
     <PukCode></PukCode>
     </request>'''
diff --git a/docker-compose.yml b/docker-compose.yml
index 0212bd4..7bfabda 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -6,6 +6,7 @@ services:
     container_name: "huawei-3g-sms-api"
     restart: "unless-stopped"
     mem_limit: "256m"
+    # Warning: may not work on ARM (ie: odroid n2)
     cpus: 0.3
     cpu_shares: 1024
     pids_limit: 200