diff --git a/hgext/evolve.py b/hgext/evolve.py
--- a/hgext/evolve.py
+++ b/hgext/evolve.py
@@ -1711,7 +1711,7 @@
 def cmdprune(ui, repo, *revs, **opts):
     """hide changesets by marking them obsolete
 
-    Obsolete changesets becomes invisible to all commands.
+    Obsolete changesets become invisible to all commands.
 
     Unpruned descendants of pruned changesets becomes "unstable". Use the
     :hg:`evolve` to handle such situation.