diff --git a/check_hetzner_storagebox.py b/check_hetzner_storagebox.py
index 27cfc23..467b232 100755
--- a/check_hetzner_storagebox.py
+++ b/check_hetzner_storagebox.py
@@ -3,7 +3,7 @@
 import argparse
 import requests
 
-# Return codes
+# Mapping return codes to exit Codes
 OK = 0
 WARNING = 1
 CRITICAL = 2
@@ -13,29 +13,57 @@
 
 api_url = "https://robot-ws.your-server.de/storagebox/{id}"
 
+# String to give back with status, text and performance data later filled in
 status_str = "{status} - {text} | {label}={value} {unit};{warn};{crit};{min};{max}"
+
+# String to give back in case of an error, performance data intentionally without information
 status_str_no_data = "{status} - {text} | UNKOWN=0MB;0;0;0;0"
 
 
 def give_back(status: int, filled_in_status_str: str):
+    """
+    Method to give back information. Prints out message and exits with given exit Code
+    :param status: Numeric exit code 0=OK,1=WARNING...
+    :param filled_in_status_str: Status string to print out before exiting
+    """
     print(filled_in_status_str)
     raise SystemExit(status)
 
 
 def check_sb(user: str, password: str, id: int, warning_percent: int, critical_percent: int):
+    """
+    Method that accesses the Hetzner Robot Webservice API, reads out StorageBox Usage and Quota and calls the give_back() method to indicate the results.
+    :param user: API user
+    :param password: API password
+    :param id: StorageBox ID
+    :param warning_percent: Percentage (0-100), when usage suprasses this value the status "WARNING" is issued
+    :param critical_percent: Percentage (0-100), when usage surpasses this value the status "CRITICAL" is issued
+    """
+    # Issue GET request to API
     r = requests.get(api_url.format(id=id), auth=(user, password))
     if r.status_code == 200:
+        # API request succeded
+        # Parse json to Dict, access data about storagebox
         data = r.json()["storagebox"]
+        # Get disk quota in MB
         quota = data["disk_quota"]
-        quota_gb = round(quota / 1024, 1)
+        # Calculate Quota in GB, round without decimal points as quotas are expected to be round numbers of GB
+        quota_gb = round(quota / 1024, 0)
+        # Get disk usage in MB
         used = data["disk_usage"]
+        # Convert in GB
         used_gb = round(used / 1024, 2)
+        # Get name of storagebox
         name = data["name"]
+        # Calculate the MB counts from which status 'WARNING'/'CRITICAL' are issued for performance data
         warning_mb = quota * warning_percent / 100
         critical_mb = quota * critical_percent / 100
         if name == "":
+            # If no name is set for storagebox default to server address
             name = data["server"]
+        # Calculate percentage of used space
         percentage: int = round(used / quota * 100, 0)
+        # Default to status 'OK'
         monitoring_status: int = OK
         status: str = "OK"
         if percentage >= critical_percent:
@@ -44,19 +72,26 @@ def check_sb(user: str, password: str, id: int, warning_percent: int, critical_p
         elif percentage >= warning_percent:
             monitoring_status = WARNING
             status = "WARNING"
+        # Create longtext message
         message = f"Storagebox {name}: {used_gb}GB of {quota_gb}GB used"
+        # Fill in status string
         status_long = status_str.format(status=status, text=message, label=name, value=used, unit="MB", warn=warning_mb, crit=critical_mb, min=0, max=quota)
+        # Return the data to calles, e.g. icinga/Nagios
         give_back(monitoring_status, status_long)
     elif r.status_code == 404:
+        # Storagebox not found under this user
         give_back(UNKNOWN,
                   status_str_no_data.format(status="UNKOWN", text="API HTTP STATUS 404, Please check Storagebox ID"))
     elif r.status_code == 401:
+        # Credentials not valid for access
         give_back(UNKNOWN,
                   status_str_no_data.format(status="UNKOWN", text="API HTTP STATUS 401, Please check credentials"))
     elif 500 <= r.status_code <= 599:
+        # Some internal server Error
         give_back(UNKNOWN, status_str_no_data.format(status="UNKOWN",
                                                      text=f"API HTTP STATUS {r.status_code}, Internal Server Error at Hetzner API"))
     else:
+        # Catch all other errors
         give_back(UNKNOWN, status_str_no_data.format(status="UNKOWN", text=f"API HTTP STATUS {r.status_code}"))