diff --git a/oca_repo_maintainer/cli/manage.py b/oca_repo_maintainer/cli/manage.py
index 394b33c..ab52a1a 100644
--- a/oca_repo_maintainer/cli/manage.py
+++ b/oca_repo_maintainer/cli/manage.py
@@ -32,9 +32,14 @@ def manage(conf_dir, org, token):
 @click.option(
     "--default/--no-default", default=True, help="Set default branch as default."
 )
-def add_branch(conf_dir, branch, default=True):
+@click.option("--repo-whitelist", help="CSV list of repo names to update")
+def add_branch(conf_dir, branch, default=True, repo_whitelist=None):
     """Add a branch to all repositories in the configuration."""
-    ConfFileManager(conf_dir).add_branch(branch, default=default)
+    if repo_whitelist:
+        repo_whitelist = [x.strip() for x in repo_whitelist.split(",") if x.strip()]
+    ConfFileManager(conf_dir).add_branch(
+        branch, default=default, repo_whitelist=repo_whitelist
+    )
 
 
 if __name__ == "__main__":
diff --git a/oca_repo_maintainer/tools/conf_file_manager.py b/oca_repo_maintainer/tools/conf_file_manager.py
index 7a335a4..8897784 100644
--- a/oca_repo_maintainer/tools/conf_file_manager.py
+++ b/oca_repo_maintainer/tools/conf_file_manager.py
@@ -26,10 +26,13 @@ def __init__(self, conf_dir):
             "repo", checksum=False, by_filepath=True
         )
 
-    def add_branch(self, branch, default=True):
+    def add_branch(self, branch, default=True, repo_whitelist=None):
         """Add a branch to all repositories in the configuration."""
         for filepath, repo in self.conf_repo.items():
-            for repo_data in repo.values():
+            changed = False
+            for repo_slug, repo_data in repo.items():
+                if repo_whitelist and repo_slug not in repo_whitelist:
+                    continue
                 if self._has_manual_branch_mgmt(repo_data):
                     _logger.info(
                         "Skipping repo %s as manual_branch_mgmt is enabled.",
@@ -38,10 +41,13 @@ def add_branch(self, branch, default=True):
                     continue
                 if self._can_add_new_branch(branch, repo_data):
                     repo_data["branches"].append(branch)
+                    changed = True
                 if default and self._can_change_default_branch(repo_data):
                     repo_data["default_branch"] = branch
-            self.conf_loader.save_conf(filepath, repo)
-            _logger.info("Branch %s added to %s.", branch, filepath.as_posix())
+                    changed = True
+            if changed:
+                self.conf_loader.save_conf(filepath, repo)
+                _logger.info("Branch %s added to %s.", branch, filepath.as_posix())
 
     def _has_manual_branch_mgmt(self, repo_data):
         return repo_data.get("manual_branch_mgmt")