diff --git a/manual/custom.py b/manual/custom.py
index e9d10ed09e..984302eee8 100644
--- a/manual/custom.py
+++ b/manual/custom.py
@@ -72,6 +72,12 @@ CLI_PREAMBLE='''\
 {usage}
 '''
 
+def titlecase(app, x):
+    if x and app.config.language == 'en':
+        from calibre.utils.titlecase import titlecase as tc
+        x = tc(x)
+    return x
+
 def generate_calibredb_help(preamble, app):
     from calibre.library.cli import COMMANDS, get_parser
     import calibre.library.cli as cli
@@ -86,7 +92,7 @@ def generate_calibredb_help(preamble, app):
     global_parser = get_parser('')
     groups = []
     for grp in global_parser.option_groups:
-        groups.append((grp.title, grp.description, grp.option_list))
+        groups.append((titlecase(app, grp.title), grp.description, grp.option_list))
 
     global_options = '\n'.join(render_options('calibredb', groups, False, False))
 
@@ -114,7 +120,7 @@ def generate_calibredb_help(preamble, app):
         for group in parser.option_groups:
             if not getattr(group, 'is_global_options', False):
                 lines.extend(render_options(
-                    'calibredb_' + cmd, [[group.title, group.description, group.option_list]], False, False, header_level='^'))
+                    'calibredb_' + cmd, [[titlecase(app, group.title), group.description, group.option_list]], False, False, header_level='^'))
         lines += ['']
 
     raw = preamble + '\n\n'+'.. contents::\n  :local:'+ '\n\n' + global_options+'\n\n'+'\n'.join(lines)
@@ -132,7 +138,7 @@ def generate_ebook_convert_help(preamble, app):
     groups = [(None, None, parser.option_list)]
     for grp in parser.option_groups:
         if grp.title not in {'INPUT OPTIONS', 'OUTPUT OPTIONS'}:
-            groups.append((grp.title.title(), grp.description, grp.option_list))
+            groups.append((titlecase(app, grp.title), grp.description, grp.option_list))
     options = '\n'.join(render_options('ebook-convert', groups, False))
 
     raw += '\n\n.. contents::\n  :local:'