diff --git a/demos/demo_operation_log.sh b/demos/demo_operation_log.sh
index d566d4aa5..854a31583 100755
--- a/demos/demo_operation_log.sh
+++ b/demos/demo_operation_log.sh
@@ -47,7 +47,7 @@ expect_prompt
 pause 7
 run_command ""
 run_command "# Let'\''s undo that rebase operation:"
-run_command "jj undo -o $rebase_op"
+run_command "jj undo $rebase_op"
 pause 3
 run_command "# The \"stuff\" change is now back on master as"
 run_command "# expected:"
@@ -58,7 +58,7 @@ run_command "# after the rebase operation:"
 run_command "jj --at-op $rebase_op log"
 pause 5
 run_command "# Looks nice, let'\''s go back to that point:"
-run_command "jj op restore -o $rebase_op"
+run_command "jj op restore $rebase_op"
 pause 2
 run_command ""
 run_command "# We'\''re now back to before the \"other stuff\""
diff --git a/docs/git-comparison.md b/docs/git-comparison.md
index a6ee84438..135c0a687 100644
--- a/docs/git-comparison.md
+++ b/docs/git-comparison.md
@@ -290,7 +290,7 @@ parent.
     </tr>
     <tr>
       <td>Undo an earlier operation</td>
-      <td><code>jj [op] undo -o &lt;operation ID&gt;</code>
+      <td><code>jj [op] undo &lt;operation ID&gt;</code>
           (<code>jj undo</code> is an alias for <code>jj op undo</code>)
       </td>
       <td>Not supported</td>