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diff --git a/docs/tags.md b/docs/tags.md
index 5c4492bc..cee8e335 100644
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+++ b/docs/tags.md
@@ -240,6 +240,9 @@ that room, the column's tallest pane is halved instead; where no pane of the
column can give it, the new pane is refused and closed, with `no space for a
pane in that column: each keeps its tag and 2 rows` (a 9P write or open of
`pane/new` fails with it, ENOSPC). A pane alone in its column always fits.
+A `+Errors` pane goes to any column with room, the last first; with none,
+what it would have shown (an Edit's `p` or `=`, a write to `errors`) is
+logged as `msg` records, a line each, and the Edit still succeeds.
`Placement acme` is acme's makenewwindow (util.c:449-495). The core keeps
acme's *active column* (activecol, dat.c:37): the column last typed in