diff --git a/autoload/tablemode/spreadsheet.vim b/autoload/tablemode/spreadsheet.vim
index f617809..005272e 100644
--- a/autoload/tablemode/spreadsheet.vim
+++ b/autoload/tablemode/spreadsheet.vim
@@ -1,4 +1,76 @@
 " Private Functions {{{1
+function! s:Min(list) "{{{2
+  let result = v:null
+  for item in a:list
+    if empty(item)
+      continue
+    endif
+    if type(item) == type(1) || type(item) == type(1.0)
+      if result == v:null || item < result
+        let result = item
+      endif
+    elseif type(item) == type('')
+      let val = str2float(item)
+      if result == v:null || val < result
+        let result = val
+      endif
+    elseif type(item) == type([])
+      let val = s:Sum(item)
+      if result == v:null || val < result
+        let result = val
+      endif
+    endif
+  endfor
+  return result == v:null ? 0 : result
+endfunction
+
+function! s:Max(list) "{{{2
+  let result = v:null
+  for item in a:list
+    if empty(item)
+      continue
+    endif
+    if type(item) == type(1) || type(item) == type(1.0)
+      if result == v:null || item > result
+        let result = item
+      endif
+    elseif type(item) == type('')
+      let val = str2float(item)
+      if result == v:null || val > result
+        let result = val
+      endif
+    elseif type(item) == type([])
+      let val = s:Sum(item)
+      if result == v:null || val > result
+        let result = val
+      endif
+    endif
+  endfor
+  return result == v:null ? 0 : result
+endfunction
+
+function! s:CountE(list) "{{{2
+  let result = 0
+  for item in a:list
+    if empty(item)
+      let result += 1
+    endif
+  endfor
+  return result
+endfunction
+
+function! s:CountNE(list) "{{{2
+  return len(a:list)-s:CountE(a:list)
+endfunction
+
+function! s:PercentE(list) "{{{2
+  return (s:CountE(a:list)*100)/len(a:list)
+endfunction
+
+function! s:PercentNE(list) "{{{2
+  return (s:CountNE(a:list)*100)/len(a:list)
+endfunction
+
 function! s:Sum(list) "{{{2
   let result = 0.0
   for item in a:list
@@ -17,6 +89,10 @@ function! s:Average(list) "{{{2
   return s:Sum(a:list)/len(a:list)
 endfunction
 
+function! s:AverageNE(list) "{{{2
+  return s:Sum(a:list)/s:CountNE(a:list)
+endfunction
+
 " Public Functions {{{1
 function! tablemode#spreadsheet#GetFirstRow(line) "{{{2
   if tablemode#table#IsRow(a:line)
@@ -244,6 +320,42 @@ function! tablemode#spreadsheet#InsertColumn(after) "{{{2
   endif
 endfunction
 
+function! tablemode#spreadsheet#Min(range, ...) abort "{{{2
+  let args = copy(a:000)
+  call insert(args, a:range)
+  return s:Min(call('tablemode#spreadsheet#cell#GetCellRange', args))
+endfunction
+
+function! tablemode#spreadsheet#Max(range, ...) abort "{{{2
+  let args = copy(a:000)
+  call insert(args, a:range)
+  return s:Max(call('tablemode#spreadsheet#cell#GetCellRange', args))
+endfunction
+
+function! tablemode#spreadsheet#CountE(range, ...) abort "{{{2
+  let args = copy(a:000)
+  call insert(args, a:range)
+  return s:CountE(call('tablemode#spreadsheet#cell#GetCellRange', args))
+endfunction
+
+function! tablemode#spreadsheet#CountNE(range, ...) abort "{{{2
+  let args = copy(a:000)
+  call insert(args, a:range)
+  return s:CountNE(call('tablemode#spreadsheet#cell#GetCellRange', args))
+endfunction
+
+function! tablemode#spreadsheet#PercentE(range, ...) abort "{{{2
+  let args = copy(a:000)
+  call insert(args, a:range)
+  return s:PercentE(call('tablemode#spreadsheet#cell#GetCellRange', args))
+endfunction
+
+function! tablemode#spreadsheet#PercentNE(range, ...) abort "{{{2
+  let args = copy(a:000)
+  call insert(args, a:range)
+  return s:PercentNE(call('tablemode#spreadsheet#cell#GetCellRange', args))
+endfunction
+
 function! tablemode#spreadsheet#Sum(range, ...) abort "{{{2
   let args = copy(a:000)
   call insert(args, a:range)
@@ -256,6 +368,12 @@ function! tablemode#spreadsheet#Average(range, ...) abort "{{{2
   return s:Average(call('tablemode#spreadsheet#cell#GetCellRange', args))
 endfunction
 
+function! tablemode#spreadsheet#AverageNE(range, ...) abort "{{{2
+  let args = copy(a:000)
+  call insert(args, a:range)
+  return s:AverageNE(call('tablemode#spreadsheet#cell#GetCellRange', args))
+endfunction
+
 function! tablemode#spreadsheet#Sort(bang, ...) range "{{{2
   if exists('*getcurpos')
     let col = getcurpos()[4] " curswant
diff --git a/autoload/tablemode/spreadsheet/formula.vim b/autoload/tablemode/spreadsheet/formula.vim
index cfe3337..85e840f 100644
--- a/autoload/tablemode/spreadsheet/formula.vim
+++ b/autoload/tablemode/spreadsheet/formula.vim
@@ -15,6 +15,9 @@ function! tablemode#spreadsheet#formula#Add(...) "{{{2
     let fr = '$' . row . ',' . colm . '=' . fr
     let fline = tablemode#spreadsheet#GetLastRow('.') + 1
     if tablemode#table#IsBorder(fline) | let fline += 1 | endif
+    if getline(fline) =~# '^\s*<!--' " ignore line with an HTML comment tag
+      let fline += 1
+    endif
     let cursor_pos = [line('.'), col('.')]
     if getline(fline) =~# 'tmf: '
       " Comment line correctly
@@ -55,6 +58,30 @@ function! tablemode#spreadsheet#formula#EvaluateExpr(expr, line) abort "{{{2
     let [row, colm] = [0, str2nr(cell)]
   endif
 
+  if expr =~# 'Min(.*)'
+    let expr = substitute(expr, 'Min(\([^)]*\))', 'tablemode#spreadsheet#Min("\1",'.line.','.colm.')', 'g')
+  endif
+
+  if expr =~# 'Max(.*)'
+    let expr = substitute(expr, 'Max(\([^)]*\))', 'tablemode#spreadsheet#Max("\1",'.line.','.colm.')', 'g')
+  endif
+
+  if expr =~# 'CountE(.*)'
+    let expr = substitute(expr, 'CountE(\([^)]*\))', 'tablemode#spreadsheet#CountE("\1",'.line.','.colm.')', 'g')
+  endif
+
+  if expr =~# 'CountNE(.*)'
+    let expr = substitute(expr, 'CountNE(\([^)]*\))', 'tablemode#spreadsheet#CountNE("\1",'.line.','.colm.')', 'g')
+  endif
+
+  if expr =~# 'PercentE(.*)'
+    let expr = substitute(expr, 'PercentE(\([^)]*\))', 'tablemode#spreadsheet#PercentE("\1",'.line.','.colm.')', 'g')
+  endif
+
+  if expr =~# 'PercentNE(.*)'
+    let expr = substitute(expr, 'PercentNE(\([^)]*\))', 'tablemode#spreadsheet#PercentNE("\1",'.line.','.colm.')', 'g')
+  endif
+
   if expr =~# 'Sum(.*)'
     let expr = substitute(expr, 'Sum(\([^)]*\))', 'tablemode#spreadsheet#Sum("\1",'.line.','.colm.')', 'g')
   endif
@@ -63,6 +90,10 @@ function! tablemode#spreadsheet#formula#EvaluateExpr(expr, line) abort "{{{2
     let expr = substitute(expr, 'Average(\([^)]*\))', 'tablemode#spreadsheet#Average("\1",'.line.','.colm.')', 'g')
   endif
 
+  if expr =~# 'AverageNE(.*)'
+    let expr = substitute(expr, 'AverageNE(\([^)]*\))', 'tablemode#spreadsheet#AverageNE("\1",'.line.','.colm.')', 'g')
+  endif
+
   if expr =~# '\$\-\?\d\+,\-\?\d\+'
     let expr = substitute(expr, '\$\(\-\?\d\+\),\(\-\?\d\+\)',
           \ '\=str2float(tablemode#spreadsheet#cell#GetCells(line, submatch(1), submatch(2)))', 'g')
@@ -107,6 +138,9 @@ function! tablemode#spreadsheet#formula#EvaluateFormulaLine() abort "{{{2
   if tablemode#table#IsRow('.') " We're inside the table
     let line = tablemode#spreadsheet#GetLastRow('.')
     let fline = line + 1
+    if getline(fline) =~# '^\s*<!--' " ignore line with an HTML comment tag
+      let fline += 1
+    endif
     if tablemode#table#IsBorder(fline) | let fline += 1 | endif
     while s:IsFormulaLine(fline)
       let exprs += split(matchstr(getline(fline), matchexpr), ';')
@@ -116,6 +150,9 @@ function! tablemode#spreadsheet#formula#EvaluateFormulaLine() abort "{{{2
     let fline = line('.')
     let line = line('.') - 1
     while s:IsFormulaLine(line) | let fline = line | let line -= 1 | endwhile
+    if getline(fline) =~# '^\s*<!--' " ignore line with an HTML comment tag
+      let line -= 1
+    endif
     if tablemode#table#IsBorder(line) | let line -= 1 | endif
     if tablemode#table#IsRow(line)
       " let exprs = split(matchstr(getline('.'), matchexpr), ';')
diff --git a/doc/table-mode.txt b/doc/table-mode.txt
index ae9a407..3544ec6 100644
--- a/doc/table-mode.txt
+++ b/doc/table-mode.txt
@@ -120,8 +120,11 @@ Formula Expressions :
 	The formula can be a simple mathematical expression involving cells
 	which are also defined by the same format as that of the target cell.
 	Apart from basic mathematical expressions, table mode also provides
-	special functions 'Sum' and 'Average'. Both these functions take a
-	range as input. A range can be of two forms :
+	special functions 'Min', 'Max', 'CountE' (number of empty cells),
+        'CountNE' (number of non-empty cells), 'PercentE' (percent of empty
+        cells), 'PercentNE' (percent of non-empty cells), 'Sum', 'Average',
+        and 'AverageNE' (average over non-empty cells). All these functions
+        take a range as input. A range can be of two forms :
 
 		'n:m': This represents cells in the current column from row
 		'n' through 'm'. If 'm' is negative it represents 'm' row