--- a/tests/test-help.t	Sat Feb 08 10:22:47 2020 -0500
+++ b/tests/test-help.t	Fri Feb 07 13:54:09 2020 -0500
@@ -1055,6 +1055,8 @@
    debugsub      (no help text available)
    debugsuccessorssets
                  show set of successors for revision
+   debugtagscache
+                 display the contents of .hg/cache/hgtagsfnodes1
    debugtemplate
                  parse and apply a template
    debuguigetpass