diff --git a/mock/py/mockbuild/util.py b/mock/py/mockbuild/util.py
index a8cdd0f39..30dd108c4 100644
--- a/mock/py/mockbuild/util.py
+++ b/mock/py/mockbuild/util.py
@@ -991,11 +991,16 @@ def add_local_repo(config_opts, baseurl, repoid=None, bootstrap=None):
 best=1
 """.format(repoid=repoid, baseurl=baseurl)
 
-    config_opts['{0}.conf'.format(config_opts['package_manager'])] += localyumrepo
+    def _fix_cfg(cfg):
+        cfg['dnf.conf'] += localyumrepo
+
+    _fix_cfg(config_opts)
 
     if bootstrap is None:
         return
 
+    _fix_cfg(bootstrap.config)
+
     if not baseurl.startswith("file:///") and not baseurl.startswith("/"):
         return
 
diff --git a/releng/release-notes-next/addrepo-affects-bootstrap.feature b/releng/release-notes-next/addrepo-affects-bootstrap.feature
new file mode 100644
index 000000000..a82e71f3a
--- /dev/null
+++ b/releng/release-notes-next/addrepo-affects-bootstrap.feature
@@ -0,0 +1,8 @@
+The `--addrepo` option has been updated to affect both the bootstrap chroot
+installation and the buildroot installation, as requested in [issue#1414][].
+However, be cautious, as Mock [aggressively caches the bootstrap][issue#1289].
+Always remember to run `mock -r <chroot> --scrub=bootstrap` first.
+Additionally, as more chroots are being switched to `bootstrap_image_ready =
+True`, you'll likely need to use `--addrepo` **in combination with**
+`--no-bootstrap-image`; otherwise, the bootstrap chroot installation will remain
+unaffected.