diff --git a/README b/README
index fd63619..13adceb 100644
--- a/README
+++ b/README
@@ -11,3 +11,13 @@ The script operates based on project names. It will put all entries
 that are a part of project "A" into a worksheet with with the name "A".
 It can create new sheets when the project worksheet does not exist, or just
 ignore it.
+
+
+Example sheet:
+Datum      | Popis            | 30 | Hodinovka | 138 Kč
+1. 1. 2022 | (no description) | 15 | 69 Kč     | 69 Kč
+2. 1. 2022 | (no description) | 15 | 69 Kč     | 69 Kč
+
+In the sheet the first row is a header and there must not be any
+breaks in the entries. toggl2sheets will find first empty row and insert
+the new entries before it.
diff --git a/toggl2sheets.py b/toggl2sheets.py
index 87033e2..6e517c6 100644
--- a/toggl2sheets.py
+++ b/toggl2sheets.py
@@ -80,10 +80,6 @@ def append_hours(worksheet: Worksheet, data: List[List[str]]):
 
     worksheet.insert_rows(last_row, len(d), d)
 
-    # inserting rows changes the top sums
-    worksheet.update_value("C1", f"=SUM(C2:C{last_row+len(d)})", True)
-    worksheet.update_value("E1", f"=SUM(E2:E{last_row+len(d)})", True)
-
 
 def get_toggl_entries(
     token: str, work_id: int, last_edit: datetime.datetime
@@ -180,7 +176,7 @@ def main():
                 # create a new worksheet with a header
                 worksheet = sh.add_worksheet(key)
                 worksheet.insert_rows(
-                    0, 1, [["Datum", "Popis", "0", "Hodinovka", "0,0 Kč"]]
+                    0, 1, [["Datum", "Popis", "=SUM(C2:C)", "Hodinovka", "=SUM(E2:E)"]]
                 )
             else:
                 continue