diff --git a/mock/docs/mock.1 b/mock/docs/mock.1
index d4319d3c0..2aa031de3 100644
--- a/mock/docs/mock.1
+++ b/mock/docs/mock.1
@@ -284,10 +284,9 @@ Note: While you can specify more commands on a command line, only one can be exe
 .LP
 .TP
 \fB\-a\fR, \fB\-\-addrepo\fR=\fIREPO\fP
-Add this repo baseurl to the yumconfig for the chroot. This can be specified
-multiple times. Let's you point to multiple paths beyond the default to pull
-build deps from.
-
+Add a repo baseurl to the DNF/YUM configuration for both the build chroot and
+the bootstrap chroot.  This option can be specified multiple times, allowing you
+to reference multiple repositories in addition to the default repository set.
 .TP
 \fB\-\-arch\fR=\fIARCH\fP
 Calls the Linux personality() syscall to tell the kernel to emulate a secondary architecture. For example, building i386 packages on an x86_64 buildhost.
diff --git a/mock/py/mock.py b/mock/py/mock.py
index 3d1a5f42e..75960d1ce 100755
--- a/mock/py/mock.py
+++ b/mock/py/mock.py
@@ -224,9 +224,13 @@ def command_parse():
     parser.add_option('-c', '--continue', default=False, action='store_true',
                       dest='cont',
                       help="if a pkg fails to build, continue to the next one")
-    parser.add_option('-a', '--addrepo', default=[], action='append',
-                      dest='repos',
-                      help="add these repo baseurls to the chroot's yum config")
+    parser.add_option(
+        '-a', '--addrepo', default=[], action='append', dest='repos',
+        metavar="REPO", help=(
+            "Add a repo baseurl to the DNF/YUM configuration for both the "
+            "build chroot and the bootstrap chroot.  This option can be "
+            "specified multiple times, allowing you to reference multiple "
+            "repositories in addition to the default repository set."))
     parser.add_option('--recurse', default=False, action='store_true',
                       help="if more than one pkg and it fails to build, try to build the rest and come back to it")
     parser.add_option('--tmp_prefix', default=None, dest='tmp_prefix',
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.