diff --git a/src/gui/gsc_info_window.cpp b/src/gui/gsc_info_window.cpp
index c4074b8..3bc12f3 100644
--- a/src/gui/gsc_info_window.cpp
+++ b/src/gui/gsc_info_window.cpp
@@ -1465,7 +1465,7 @@ void GscInfoWindow::fill_ui_self_test_log(const StoragePropertyRepository& prope
 
 	model_columns.add(columns_->self_test_log_table_columns.hours);
 	num_tree_col = app_gtkmm_create_tree_view_column(columns_->self_test_log_table_columns.hours, *treeview,
-			_("Lifetime hours"), _("During which hour of the drive's (powered on) lifetime did the test complete (or abort)"), true);
+			_("Lifetime hours"), _("Hour of the drive's powered-on lifetime when the test completed or aborted.\nThe value wraps after 36535 hours."), true);
 
 	model_columns.add(columns_->self_test_log_table_columns.lba);
 	num_tree_col = app_gtkmm_create_tree_view_column(columns_->self_test_log_table_columns.lba, *treeview,
@@ -1572,7 +1572,7 @@ void GscInfoWindow::fill_ui_ata_error_log(const StoragePropertyRepository& prope
 
 	model_columns.add(columns_->error_log_table_columns.hours);
 	num_tree_col = app_gtkmm_create_tree_view_column(columns_->error_log_table_columns.hours, *treeview,
-			_("Lifetime hours"), _("During which hour of the drive's (powered on) lifetime did the error happen."), true);
+			_("Lifetime hours"), _("Hour of the drive's powered-on lifetime when the error occurred"), true);
 
 	model_columns.add(columns_->error_log_table_columns.state);
 	num_tree_col = app_gtkmm_create_tree_view_column(columns_->error_log_table_columns.state, *treeview,