diff --git a/example.env b/example.env
index 0a79f40..11fa00e 100644
--- a/example.env
+++ b/example.env
@@ -31,5 +31,5 @@ REDIS_PATH=redis://redis
 # Set log level, can be CRITICAL, ERROR, WARNING, INFO, DEBUG. By default it set to WARNING.
 LOGLEVEL=
 
-# Uncomment this to switch bot language to Chinese
-# O_LANG=zh
+# Uncomment this to switch bot language to English
+# O_LANG=en
diff --git a/olgram/settings.py b/olgram/settings.py
index 56524a3..fed833f 100644
--- a/olgram/settings.py
+++ b/olgram/settings.py
@@ -105,7 +105,7 @@ class ServerSettings(AbstractSettings):
         return int(timedelta(days=1).total_seconds() * 1000.0)
 
 
-logging.basicConfig(level=os.environ.get("LOGLEVEL", "WARNING"),
+logging.basicConfig(level=os.environ.get("LOGLEVEL") or "WARNING",
                     format='%(asctime)s %(levelname)-8s %(message)s')