diff --git a/autoload/tablemode/spreadsheet/formula.vim b/autoload/tablemode/spreadsheet/formula.vim
index f54c53b..e1d0026 100644
--- a/autoload/tablemode/spreadsheet/formula.vim
+++ b/autoload/tablemode/spreadsheet/formula.vim
@@ -1,12 +1,12 @@
 " Private Functions {{{1
-function! s:IsHTMLComment(line) "{{{2
-  return getline(a:line) =~# '^\s*<!--'
-endfunction
-
 function! s:IsFormulaLine(line) "{{{2
   return getline(a:line) =~# 'tmf: '
 endfunction
 
+function! s:IsHTMLComment(line) "{{{2
+  return !s:IsFormulaLine(a:line) && getline(a:line) =~# '^\s*<!--'
+endfunction
+
 " Public Functions {{{1
 function! tablemode#spreadsheet#formula#Add(...) "{{{2
   let fr = a:0 ? a:1 : input('f=')