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diff --git a/docs/tags.md b/docs/tags.md
index f1e4a420..de540c91 100644
--- a/docs/tags.md
+++ b/docs/tags.md
@@ -43,6 +43,10 @@ Its text and terminal process are kept;
the command stays available in the visible tag. Every default pane tag includes
`Collapse`, including file, terminal, image, and PDF panes.
+`Undo` and `Redo` are acme's: typed or clicked in a pane's tag, or written
+to its `ctl`, they step the body back and forward through its edits, as the
+`u` and `U` keys do. They are not in the default tags.
+
`Del` closes a pane and gives its rows to one neighbor; the rest of the
column keeps its heights. `Del k` (or `DelAbove`) gives them to the nearest
expanded pane above, `Del j` (or `DelBelow`) to the one below, each falling