diff --git a/src/xlsxtocsv.rs b/src/xlsxtocsv.rs
index 066045b..4d103d2 100644
--- a/src/xlsxtocsv.rs
+++ b/src/xlsxtocsv.rs
@@ -8,6 +8,7 @@ pub fn xlsxtocsv(args: &Arguments) -> Result<(), Error> {
     let book = reader::xlsx::read(Path::new(&args.file))
         .expect(format!("Can't open {}", args.file).as_str());
 
+    // get the sheet from name or number if specified, else the first of the spreadsheet
     let sheet = match book.get_sheet_by_name(&args.worksheet) {
         Some(sheet) => sheet,
         None => {
@@ -23,6 +24,7 @@ pub fn xlsxtocsv(args: &Arguments) -> Result<(), Error> {
         }
     };
 
+    // set the merged cells policy
     let (horiz, vert) = match args.fill_merged_cells {
         crate::arguments::FillMergedCells::None => (false, false),
         crate::arguments::FillMergedCells::Horizontal => (true, false),
@@ -30,11 +32,18 @@ pub fn xlsxtocsv(args: &Arguments) -> Result<(), Error> {
         crate::arguments::FillMergedCells::Both => (true, true),
     };
 
+    // get all the merged cells
     let merged_cells = MergedCells::new(sheet, horiz, vert);
 
+    // get size of the worksheet
     let (num_cols, num_rows) = sheet.get_highest_column_and_row();
 
+    // TODO get every hidden columns
+
+    // for each row...
     for i in 1..=num_rows {
+
+        // Avoid hidden rows if asked for
         if !args.include_hidden_lines {
             match sheet.get_row_dimension(&i) {
                 Some(dim) => {
@@ -45,6 +54,8 @@ pub fn xlsxtocsv(args: &Arguments) -> Result<(), Error> {
                 None => continue,
             }
         }
+
+        // for each column in row...
         let mut first = true;
         for j in 1..=num_cols {
             if first {
@@ -58,6 +69,7 @@ pub fn xlsxtocsv(args: &Arguments) -> Result<(), Error> {
                 None => continue,
             };
 
+            // get value from cell depending on merged cells and fill merged policy
             let cell_coordinate = cell.get_coordinate();
             let mut value;
             if let Some((col, row)) = merged_cells.in_merged_cell(
@@ -71,6 +83,8 @@ pub fn xlsxtocsv(args: &Arguments) -> Result<(), Error> {
             } else {
                 value = cell.get_formatted_value();
             }
+
+            // apply modifications to cells value (trim spaces, replace separator chars, line breaks etc.)
             if args.trim_end {
                 value = String::from(value.trim_end());
             }