diff --git a/myems-api/core/utilities.py b/myems-api/core/utilities.py
index 8cfa9e19..edf55e4e 100644
--- a/myems-api/core/utilities.py
+++ b/myems-api/core/utilities.py
@@ -12,7 +12,7 @@ import statistics
 # rows_hourly: list of (start_datetime_utc, actual_value), should belong to one energy_category_id
 # start_datetime_utc: start datetime in utc
 # end_datetime_utc: end datetime in utc
-# period_type: one of the following period types, 'hourly', 'daily', 'weekly', 'monthly' and 'yearly'
+# period_type: use one of the period types, 'hourly', 'daily', 'weekly', 'monthly' and 'yearly'
 # Note: this procedure doesn't work with multiple energy categories
 ########################################################################################################################
 def aggregate_hourly_data_by_period(rows_hourly, start_datetime_utc, end_datetime_utc, period_type):
@@ -403,7 +403,7 @@ def get_energy_category_peak_types(cost_center_id, energy_category_id, start_dat
 #   rows_hourly: list of (start_datetime_utc, actual_value), should belong to one energy_category_id
 #   start_datetime_utc: start datetime in utc
 #   end_datetime_utc: end datetime in utc
-#   period_type: one of the following period types, 'hourly', 'daily', 'monthly' and 'yearly'
+#   period_type: use one of the period types, 'hourly', 'daily', 'weekly', 'monthly' and 'yearly'
 # Returns: periodically data of average and maximum
 # Note: this procedure doesn't work with multiple energy categories
 ########################################################################################################################
@@ -692,7 +692,7 @@ def averaging_hourly_data_by_period(rows_hourly, start_datetime_utc, end_datetim
 #   rows_hourly: list of (start_datetime_utc, actual_value), should belong to one energy_category_id
 #   start_datetime_utc: start datetime in utc
 #   end_datetime_utc: end datetime in utc
-#   period_type: one of the following period types, 'hourly', 'daily', 'monthly' and 'yearly'
+#   period_type: use one of the period types, 'hourly', 'daily', 'weekly', 'monthly' and 'yearly'
 # Returns: periodically data of values and statistics of mean, median, minimum, maximum, stdev and variance
 # Note: this procedure doesn't work with multiple energy categories
 ########################################################################################################################
diff --git a/myems-api/reports/tenantbill.py b/myems-api/reports/tenantbill.py
index a748ecce..c5320de8 100644
--- a/myems-api/reports/tenantbill.py
+++ b/myems-api/reports/tenantbill.py
@@ -34,7 +34,7 @@ class Reporting:
         tenant_id = req.params.get('tenantid')
         reporting_start_datetime_local = req.params.get('reportingperiodstartdatetime')
         reporting_end_datetime_local = req.params.get('reportingperiodenddatetime')
-
+        # This value is intentionally left daily
         period_type = 'daily'
 
         ################################################################################################################
diff --git a/web/src/i18n.js b/web/src/i18n.js
index 35ac6409..e8f0b1ff 100644
--- a/web/src/i18n.js
+++ b/web/src/i18n.js
@@ -122,6 +122,7 @@ const resources = {
       "Period Types": "Period Types",
       "Yearly": "Yearly",
       "Monthly": "Monthly",
+      "Weekly": "Weekly",
       "Daily": "Daily",
       "Hourly": "Hourly",
       "Submit": "Submit",
@@ -867,6 +868,7 @@ const resources = {
       "Period Types": "Periodentypen",
       "Yearly": "Jährlich",
       "Monthly": "Monatlich",
+      "Weekly": "Wöchentlich",
       "Daily": "Täglich",
       "Hourly": "Stündlich",
       "Submit": "einreichen",