diff --git a/Development.md b/Development.md
index 7a6a0e7..a0d9453 100644
--- a/Development.md
+++ b/Development.md
@@ -21,7 +21,7 @@ php tests/php/releases.test.php                               # the release stor
 php tests/php/files.test.php                                  # uploaded files in a folder per account (#344), the same way
 php tests/php/videos.test.php                                 # the video store, its queue and the worker (#402), with the
                                                               #   real ffmpeg: the CI image and game-maker-video have it
-node tools/seed-e2e.mjs && node tools/e2e.mjs                 # 2038 editor checks, screenshots in /tmp/gm-e2e-*.png
+node tools/seed-e2e.mjs && node tools/e2e.mjs                 # 2039 editor checks, screenshots in /tmp/gm-e2e-*.png
 GM_STEPS=20 node tools/e2e.mjs                                # or 1-12, or 6,20 — a subset while working on one step
 ./e2e.sh start [GM_STEPS]                                     # the same run detached, see below
 ./e2e.sh status                                               # live progress, or the last run's result
diff --git a/Videos.md b/Videos.md
index 902136a..b0122f7 100644
--- a/Videos.md
+++ b/Videos.md
@@ -197,7 +197,32 @@ the editor itself (`src/core/recording/matroska.ts`) in clusters as the frames c
 frame rate and the colour (BT.709) in its head, so nothing has to guess them. The rules (size,
 codec level, which frames are taken, where the picture goes in a frame) are plain functions in
 `src/core/recording/recording.ts`, the browser's side is `src/viewport/GameRecorder.ts`, and
-`src/viewport/PictureReader.ts` reads the frames back through pixel buffers with a fence.
+`src/viewport/PictureReader.ts` reads the frames back through pixel buffers with a fence. The
+encoders, the sound and the file are `src/viewport/RecordingTake.ts`, which the editor recording
+below shares.
+
+## Recording the editor
+
+**Start recording** in the main menu (top left) records the whole editor, for a tutorial or a bug
+report. While it records, the entry reads **Stop recording**, and a red dot with the time stands
+beside the menu button.
+
+- **No options:** the name is `Recording <date> <time>`, the size is the editor's canvas in device
+  pixels (an odd row or column is cut off), 60 fps. The sound is the master, as for the game view.
+- **The mouse pointer is drawn in.** The system draws it over the page, so it is not in the canvas;
+  the recording draws its own in the shape the editor shows (arrow, hand, resize arrows, I-beam,
+  crosshair).
+- **The red dot is not in it.** It is drawn onto the screen after the frame is taken, and the room
+  it needs beside the menu stays empty in the recording.
+- **Everything else is**, the menu that stops it included: cut the end off afterwards if it is in
+  the way.
+- **It costs no second drawing.** The frame is copied from the canvas right after the editor drew
+  it. An idle editor draws nothing, and the recording repeats its last picture.
+- **A resized window** is fitted into the size the recording started with, centred, the rest dark.
+- It runs on through Play and Stop, beside a recording of the game view if a game starts one.
+  Saving is the same: up to the server, then a video asset once the editor is not playing.
+
+The code is `src/editor/EditorRecorder.ts`, the pointer shapes are `src/core/recording/cursors.ts`.
 
 ## The worker