diff --git a/README.md b/README.md
index 5d5034b0..3c76d41d 100644
--- a/README.md
+++ b/README.md
@@ -717,6 +717,7 @@ Next time you need this list just use an alias, like this:
         - `ignore_dnf`: [boolean=true] Exclude DNF (Do Not Fit) components.
         - `int_qtys`: [boolean=true] Component quantities are always expressed as integers. Using the ceil() function.
         - `merge_blank_fields`: [boolean=true] Component groups with blank fields will be merged into the most compatible group, where possible.
+        - `merge_both_blank`: [boolean=true] When creating groups two components with empty/missing field will be interpreted as with the same value.
         - `no_conflict`: [list(string)] List of fields where we tolerate conflicts.
                          Use it to avoid undesired warnings.
                          By default the field indicated in `fit_field` and the field `part` are excluded.
@@ -744,6 +745,7 @@ Next time you need this list just use an alias, like this:
             - `logo`: [string|boolean=''] PNG file to use as logo, use false to remove.
             - `logo_scale`: [number=2] Scaling factor for the logo. Note that this value isn't honored by all spreadsheet software.
             - `max_col_width`: [number=60] [20,999] Maximum column width (characters).
+            - `specs`: [boolean=false] Enable Specs worksheet creation.
             - `style`: [string='modern-blue'] Head style: modern-blue, modern-green, modern-red and classic.
             - `title`: [string='KiBot Bill of Materials'] BoM title.
 
diff --git a/docs/samples/generic_plot.kibot.yaml b/docs/samples/generic_plot.kibot.yaml
index 75909b34..5430059e 100644
--- a/docs/samples/generic_plot.kibot.yaml
+++ b/docs/samples/generic_plot.kibot.yaml
@@ -165,6 +165,8 @@ outputs:
       int_qtys: true
       # [boolean=true] Component groups with blank fields will be merged into the most compatible group, where possible
       merge_blank_fields: true
+      # [boolean=true] When creating groups two components with empty/missing field will be interpreted as with the same value
+      merge_both_blank: true
       # [list(string)] List of fields where we tolerate conflicts.
       # Use it to avoid undesired warnings.
       # By default the field indicated in `fit_field` and the field `part` are excluded
@@ -214,6 +216,8 @@ outputs:
         logo_scale: 2
         # [number=60] [20,999] Maximum column width (characters)
         max_col_width: 60
+        # [boolean=false] Enable Specs worksheet creation
+        specs: false
         # [string='modern-blue'] Head style: modern-blue, modern-green, modern-red and classic
         style: 'modern-blue'
         # [string='KiBot Bill of Materials'] BoM title
diff --git a/kibot/bom/xlsx_writer.py b/kibot/bom/xlsx_writer.py
index a01bb015..4fcdc9d3 100644
--- a/kibot/bom/xlsx_writer.py
+++ b/kibot/bom/xlsx_writer.py
@@ -247,6 +247,45 @@ def create_color_ref(workbook, col_colors, hl_empty, fmt_cols, do_kicost, kicost
             worksheet.write_string(row, 0, label, format)
 
 
+def create_meta(workbook, name, columns, parts, fmt_head, fmt_cols, max_w):
+    worksheet = workbook.add_worksheet(name)
+    worksheet.write_string(0, 0, 'References', fmt_head)
+    c = 1
+    to_col = {}
+    col_w = [12]
+    for col in columns:
+        worksheet.write_string(0, c, col, fmt_head)
+        to_col[col] = c
+        col_w.append(len(col))
+        c = c + 1
+    r = 1
+    for part in parts:
+        worksheet.write_string(r, 0, part.collapsed_refs, fmt_cols[0][r % 2])
+        ref_len = len(part.collapsed_refs)
+        row_h = 1
+        if ref_len > col_w[0]:
+            if ref_len > max_w:
+                row_h = len(wrap(part.collapsed_refs, max_w))
+                ref_len = max_w
+            col_w[0] = ref_len
+        for k, v in part.specs.items():
+            c = to_col[k]
+            text = v[1]
+            worksheet.write_string(r, c, text, fmt_cols[2][r % 2])
+            text_l = len(text)
+            if text_l > col_w[c]:
+                if text_l > max_w:
+                    h = len(wrap(text, max_w))
+                    row_h = max(row_h, h)
+                    text_l = max_w
+                col_w[c] = text_l
+        if row_h > 1:
+            worksheet.set_row(r, 15.0*row_h)
+        r = r + 1
+    for i, width in enumerate(col_w):
+        worksheet.set_column(i, i, width)
+
+
 def adjust_widths(worksheet, column_widths, max_width, levels):
     c_levels = len(levels)
     for i, width in enumerate(column_widths):
@@ -413,7 +452,25 @@ def compute_qtys(cfg, g):
     return [str(g.get_count(sch.name)) for sch in cfg.aggregate]
 
 
-def create_kicost_sheet(workbook, groups, image_data, fmt_title, fmt_info, fmt_subtitle, cfg):
+def create_meta_sheets(workbook, used_parts, fmt_head, fmt_cols, cfg):
+    if cfg.xlsx.specs:
+        meta_names = ['Specs', 'Specs (DNF)']
+        for ws in range(2):
+            spec_cols = {}
+            parts = used_parts[ws]
+            for part in parts:
+                for spec in part.specs:
+                    if spec in spec_cols:
+                        spec_cols[spec] += 1
+                    else:
+                        spec_cols[spec] = 1
+            if len(spec_cols):
+                c = len(parts)
+                create_meta(workbook, meta_names[ws], sorted(spec_cols, key=lambda k: (c - spec_cols[k], k)), parts, fmt_head,
+                            fmt_cols, cfg.xlsx.max_col_width)
+
+
+def create_kicost_sheet(workbook, groups, image_data, fmt_title, fmt_info, fmt_subtitle, fmt_head, fmt_cols, cfg):
     if not KICOST_SUPPORT:
         logger.warning(W_NOKICOST, 'KiCost sheet requested but failed to load KiCost support')
         return
@@ -485,6 +542,7 @@ def create_kicost_sheet(workbook, groups, image_data, fmt_title, fmt_info, fmt_s
             id = new_id.lower()
         if id in cfg.column_rename:
             v['label'] = cfg.column_rename[id]
+    used_parts = []
     for ws in range(2):
         # Second pass is DNF
         dnf = ws == 1
@@ -533,6 +591,9 @@ def create_kicost_sheet(workbook, groups, image_data, fmt_title, fmt_info, fmt_s
         if cfg.xlsx.title:
             wks.set_row(0, 32)
             wks.merge_range(0, col1, 0, ss.globals_width, cfg.xlsx.title, fmt_title)
+        used_parts.append(parts)
+    # Specs sheets
+    create_meta_sheets(workbook, used_parts, fmt_head, fmt_cols, cfg)
     colors = {}
     colors['Best price'] = ss.wrk_formats['best_price']
     colors['No manufacturer or distributor code'] = ss.wrk_formats['not_manf_codes']
@@ -670,7 +731,8 @@ def write_xlsx(filename, groups, col_fields, head_names, cfg):
     # Optionally add KiCost information
     kicost_colors = None
     if cfg.xlsx.kicost:
-        kicost_colors = create_kicost_sheet(workbook, groups, image_data, fmt_title, fmt_info, fmt_subtitle, cfg)
+        kicost_colors = create_kicost_sheet(workbook, groups, image_data, fmt_title, fmt_info, fmt_subtitle, fmt_head,
+                                            fmt_cols, cfg)
     # Add a sheet for the color references
     create_color_ref(workbook, cfg.xlsx.col_colors, hl_empty, fmt_cols, cfg.xlsx.kicost and KICOST_SUPPORT, kicost_colors)
 
diff --git a/kibot/out_bom.py b/kibot/out_bom.py
index 119b95c2..542bc7ab 100644
--- a/kibot/out_bom.py
+++ b/kibot/out_bom.py
@@ -163,6 +163,8 @@ class BoMXLSX(BoMLinkable):
             """ Head style: modern-blue, modern-green, modern-red and classic """
             self.kicost = False
             """ Enable KiCost worksheet creation """
+            self.specs = False
+            """ Enable Specs worksheet creation """
             self.logo_scale = 2
             """ Scaling factor for the logo. Note that this value isn't honored by all spreadsheet software """