1 files changed, 4 insertions, 0 deletions
diff --git a/README.md b/README.md
index d7548e8c..f60b0ed7 100644
--- a/README.md
+++ b/README.md
@@ -36,6 +36,10 @@ serves the layout: `/layout` lists the columns, their places and panes, and
 `/tag` and `/col/<serial>/tag` are the workspace and column tags, editable like a
 window's ([the tree](docs/fs.md#the-served-tree)).
 
+plan9port's `9p write` always opens with OTRUNC, so `echo x | 9p write
+pardes/<id>/body` replaces the whole body where acme would append. To append,
+write through a mount with `>>` (`echo x >> $PARDES_MOUNT/<id>/body`).
+
 ## Requirements
 
 Zig **0.16.0** (`build.zig.zon` pins `minimum_zig_version`). Dependencies are