diff --git a/bomlib/html_writer.py b/bomlib/html_writer.py
index 6945e8d..eeeb1e9 100644
--- a/bomlib/html_writer.py
+++ b/bomlib/html_writer.py
@@ -134,6 +134,50 @@ def WriteHTML(filename, groups, net, headings, prefs):
         html.write("</table>\n")
         html.write("<br><br>\n")
 
+        if prefs.generateDNF:
+            html.write("<h2>Optional components (DNF=Do Not Fit)</h2>\n")
+ 
+            # DNF component groups
+            html.write('<table border="1">\n')
+ 
+            # Row titles:
+            html.write("<tr>\n")
+            if prefs.numberRows:
+                html.write("\t<th></th>\n")
+            for i, h in enumerate(headings):
+                # Cell background color
+                bg = bgColor(h)
+                html.write('\t<th align="center"{bg}>{h}</th>\n'.format(h=h, bg=' bgcolor="{c}"'.format(c=bg) if bg else ''))
+            html.write("</tr>\n")
+ 
+            rowCount = 0
+ 
+            for i, group in enumerate(groups):
+ 
+                if not(prefs.ignoreDNF and not group.isFitted()):
+                    continue
+ 
+                row = group.getRow(headings)
+                rowCount += 1
+                html.write("<tr>\n")
+ 
+                if prefs.numberRows:
+                    html.write('\t<td align="center">{n}</td>\n'.format(n=rowCount))
+ 
+                for n, r in enumerate(row):
+ 
+                    if len(r) == 0:
+                        bg = BG_EMPTY
+                    else:
+                        bg = bgColor(headings[n])
+ 
+                    html.write('\t<td align="center"{bg}>{val}</td>\n'.format(bg=' bgcolor={c}'.format(c=bg) if bg else '', val=link(r)))
+ 
+                html.write("</tr>\n")
+
+            html.write("</table>\n")
+            html.write("<br><br>\n")
+
         html.write("</body></html>")
 
     return True
diff --git a/bomlib/preferences.py b/bomlib/preferences.py
index e4745f2..63cd239 100644
--- a/bomlib/preferences.py
+++ b/bomlib/preferences.py
@@ -32,6 +32,7 @@ class BomPref:
     OPT_ALT_WRAP = "alt_wrap"
     OPT_MERGE_BLANK = "merge_blank_fields"
     OPT_IGNORE_DNF = "ignore_dnf"
+    OPT_GENERATE_DNF = "html_generate_dnf"
     OPT_BACKUP = "make_backup"
     OPT_OUTPUT_FILE_NAME = "output_file_name"
     OPT_VARIANT_FILE_NAME_FORMAT = "variant_file_name_format"
@@ -52,6 +53,7 @@ def __init__(self):
         self.useAlt = False  # Use alternate reference representation
         self.altWrap = None  # Wrap to n items when using alt representation
         self.ignoreDNF = True  # Ignore rows for do-not-fit parts
+        self.generateDNF = True  # Generate a list of do-not-fit parts
         self.numberRows = True  # Add row-numbers to BoM output
         self.groupConnectors = True  # Group connectors and ignore component value
         self.useRegex = True  # Test various columns with regex
@@ -134,6 +136,7 @@ def Read(self, file, verbose=False):
         # Read general options
         if self.SECTION_GENERAL in cf.sections():
             self.ignoreDNF = self.checkOption(cf, self.OPT_IGNORE_DNF, default=True)
+            self.generateDNF = self.checkOption(cf, self.OPT_GENERATE_DNF, default=True)
             self.useAlt = self.checkOption(cf, self.OPT_USE_ALT, default=False)
             self.altWrap = self.checkInt(cf, self.OPT_ALT_WRAP, default=None)
             self.numberRows = self.checkOption(cf, self.OPT_NUMBER_ROWS, default=True)
@@ -209,6 +212,7 @@ def Write(self, file):
         cf.add_section(self.SECTION_GENERAL)
         cf.set(self.SECTION_GENERAL, "; General BoM options here")
         self.addOption(cf, self.OPT_IGNORE_DNF, self.ignoreDNF, comment="If '{opt}' option is set to 1, rows that are not to be fitted on the PCB will not be written to the BoM file".format(opt=self.OPT_IGNORE_DNF))
+        self.addOption(cf, self.OPT_GENERATE_DNF, self.generateDNF, comment="If '{opt}' option is set to 1, also generate a list of components not fitted on the PCB (HTML only)".format(opt=self.OPT_GENERATE_DNF))
         self.addOption(cf, self.OPT_USE_ALT, self.useAlt, comment="If '{opt}' option is set to 1, grouped references will be printed in the alternate compressed style eg: R1-R7,R18".format(opt=self.OPT_USE_ALT))
         self.addOption(cf, self.OPT_ALT_WRAP, self.altWrap, comment="If '{opt}' option is set to and integer N, the references field will wrap after N entries are printed".format(opt=self.OPT_ALT_WRAP))
         self.addOption(cf, self.OPT_NUMBER_ROWS, self.numberRows, comment="If '{opt}' option is set to 1, each row in the BoM will be prepended with an incrementing row number".format(opt=self.OPT_NUMBER_ROWS))