--- a/tests/test-userguide.t	Sat Apr 27 22:33:16 2019 -0400
+++ b/tests/test-userguide.t	Sat Apr 27 22:59:48 2019 -0400
@@ -122,7 +122,7 @@
   ~
   $ hg --hidden log -q -r 'successors(05e61aab8294) | successors(be6d5bc8e4cc) | successors(35f432d9f7c1)'
   9:171c6a79a27b
-  $ hg --hidden log -q -r 'precursors(171c6a79a27b)'
+  $ hg --hidden log -q -r 'predecessors(171c6a79a27b)'
   6:05e61aab8294
   7:be6d5bc8e4cc
   8:35f432d9f7c1