diff --git a/plugins/lxd/lxd_disk b/plugins/lxd/lxd_disk
index 16366557..04988bbc 100755
--- a/plugins/lxd/lxd_disk
+++ b/plugins/lxd/lxd_disk
@@ -10,7 +10,7 @@ try:
 except:
     HAS_LIB=False
     errors.append("no pylxd module")
-    
+
 c=None
 HAS_ACCESS=True
 try:
@@ -39,7 +39,9 @@ if len(sys.argv) == 2 and sys.argv[1]=="config":
     print("graph_info This shows the disk usage of storage in containers. Make sure to install pylxd in python3.")
     for name in c.container_list():
         info = c.container_info(name)
+        # first check if disk information list is available or None
         if info['disk']:
+            # if no disk information is present, this would fail to iteration None
             for disk in info['disk']:
                 print(name+"-"+disk+".label "+name)
                 print(name+"-"+disk+".draw LINE2")
@@ -47,6 +49,8 @@ if len(sys.argv) == 2 and sys.argv[1]=="config":
 
 for name in c.container_list():
     info = c.container_info(name)
+    # first check if disk information list is available or None
     if info['disk']:
+        # if no disk information is present, this would fail to iteration None
         for disk in info['disk']:
             print(name+"-"+disk+".value "+str(info['disk'][disk]['usage']))