diff --git a/components/fpspreadsheet/tests/formattests.pas b/components/fpspreadsheet/tests/formattests.pas
index 4c41b8612..c2afc0363 100644
--- a/components/fpspreadsheet/tests/formattests.pas
+++ b/components/fpspreadsheet/tests/formattests.pas
@@ -3,9 +3,11 @@ unit formattests;
 {$mode objfpc}{$H+}
 
 interface
-//todo: look at getting read tests from existing xls cells
-//todo: date/time sheet name is confusing=>already existing date sheet 'Dates'
-//todo: add incorrect/out of range values for testing
+{ Formatted date/time/number tests
+This unit tests writing out to and reading back from files.
+Tests that verify reading from an Excel/LibreOffice/OpenOffice file are located in other
+units (e.g. datetests).
+}
 
 uses
   // Not using lazarus package as the user may be working with multiple versions
diff --git a/components/fpspreadsheet/tests/testsutility.pas b/components/fpspreadsheet/tests/testsutility.pas
index d8e11c686..4eb06c3c9 100644
--- a/components/fpspreadsheet/tests/testsutility.pas
+++ b/components/fpspreadsheet/tests/testsutility.pas
@@ -13,7 +13,7 @@ uses
 const
   TestFileBIFF8='testbiff8.xls'; //with 1904 datemode date system
   TestFileBIFF8_1899='testbiff8_1899.xls'; //with 1899/1900 datemode date system
-  TestFileManual='testmanual.xls';
+  TestFileManual='testmanual.xls'; //file name for manual checking using external spreadsheet program (Excel/LibreOffice..)
   DatesSheet = 'Dates'; //worksheet name
   FormulasSheet = 'Formulas'; //worksheet name
   ManualSheet = 'ManualTests'; //worksheet names