diff --git a/src/python/jw/pkg/cmds/projects/CmdCreateFile.py b/src/python/jw/pkg/cmds/projects/CmdCreateFile.py
index 754f42cb..007d9734 100644
--- a/src/python/jw/pkg/cmds/projects/CmdCreateFile.py
+++ b/src/python/jw/pkg/cmds/projects/CmdCreateFile.py
@@ -132,11 +132,38 @@ class CmdCreateFile(Cmd):  # export
             metavar = 'KEY=VALUE',
             help = 'Additional fields to insert into the output file',
         )
+        parser.add_argument(
+            '--field-keys',
+            help = (
+                'Possible keys for the --field option, comma-separated. Defaults to '
+                'all passed via the --field option. If this field is specified, '
+                'passing a key in --field that\'s not specified here is an error, '
+                'and not passing one makes the respective field go away from the '
+                'rendering output'
+            )
+        )
         parser.add_argument('module', help = 'The module to generate the file for')
 
     @override
     async def _run(self, args: Namespace) -> None:
+
+        # -- Honour --field-keys option
+        fields = args.field
+        if args.field_keys:
+            passed_keys = set([field[0] for field in fields])
+            field_keys = set(args.field_keys.split(','))
+            if passed_keys - field_keys:
+                raise Exception(
+                    'The following keys in --field are not in --field-keys: ' +
+                    ', '.join(sorted(passed_keys - field_keys))
+                )
+            for key in field_keys - passed_keys:
+                fields.append((key, ''))
+
+        # -- Find method for --format
         method = getattr(self, 'render_' + args.format, None)
         if method is None:  # choices already restricts this; keeps the linter happy
             raise Exception(f'Unsupported output format {args.format}')
-        sys.stdout.write(method(args.module, args.field))
+
+        # -- Render
+        sys.stdout.write(method(args.module, fields))
diff --git a/test/integration/jw-pkg/help/test-expected.txt b/test/integration/jw-pkg/help/test-expected.txt
index 4ac25287..ae035045 100644
--- a/test/integration/jw-pkg/help/test-expected.txt
+++ b/test/integration/jw-pkg/help/test-expected.txt
@@ -336,6 +336,7 @@ usage: jw-pkg.py projects create-file [-h] --format {pyright,tmpl}
                                       [--search-path SEARCH_PATH]
                                       [--template-name TEMPLATE_NAME]
                                       [--quote] [-f KEY=VALUE]
+                                      [--field-keys FIELD_KEYS]
                                       module
 
 Generate a file from project metadata
@@ -357,6 +358,13 @@ options:
   -f, --field KEY=VALUE
                         Additional fields to insert into the output file
                         (default: [])
+  --field-keys FIELD_KEYS
+                        Possible keys for the --field option, comma-separated.
+                        Defaults to all passed via the --field option. If this
+                        field is specified, passing a key in --field that's
+                        not specified here is an error, and not passing one
+                        makes the respective field go away from the rendering
+                        output (default: None)
 ============= Running: jw-pkg.py -t ../../../.. --log-level info projects create-pkg-config --help
 usage: jw-pkg.py projects create-pkg-config [-h] [-F PROJECT_DESCR_FILE]
                                             [-d DESCRIPTION] [-n NAME]