diff -r c94fa884240b -r 471cd86c8eb4 mercurial/configitems.py
--- a/mercurial/configitems.py	Sat Mar 13 08:59:03 2021 +0100
+++ b/mercurial/configitems.py	Sun Nov 08 20:17:09 2020 +0100
@@ -866,6 +866,31 @@
 )
 coreconfigitem(
     b'experimental',
+    b'bundlecompthreads',
+    default=None,
+)
+coreconfigitem(
+    b'experimental',
+    b'bundlecompthreads.bzip2',
+    default=None,
+)
+coreconfigitem(
+    b'experimental',
+    b'bundlecompthreads.gzip',
+    default=None,
+)
+coreconfigitem(
+    b'experimental',
+    b'bundlecompthreads.none',
+    default=None,
+)
+coreconfigitem(
+    b'experimental',
+    b'bundlecompthreads.zstd',
+    default=None,
+)
+coreconfigitem(
+    b'experimental',
     b'changegroup3',
     default=False,
 )