diff --git a/tests/t1500-do.sh b/tests/t1500-do.sh
index 545613b..8bae9b6 100755
--- a/tests/t1500-do.sh
+++ b/tests/t1500-do.sh
@@ -81,6 +81,6 @@ test_todo_session 'fail multiple do attempts' <<EOF
 TODO: 3 marked as done.
 
 >>> todo.sh -a do 3
-3 is already marked done
+TODO: 3 is already marked done.
 EOF
 test_done
diff --git a/todo.sh b/todo.sh
index 281c6a1..f10ff37 100755
--- a/todo.sh
+++ b/todo.sh
@@ -961,7 +961,7 @@ case $action in
                 echo "TODO: $item marked as done."
 	    fi
         else
-            echo "$item is already marked done"
+            echo "TODO: $item is already marked done."
         fi
     done