diff --git a/Development.md b/Development.md
index b7c7e91..6c1e678 100644
--- a/Development.md
+++ b/Development.md
@@ -12,7 +12,7 @@ npm run check        # typecheck + lint + format:check + tests, the gate CI runs
                      #   code is lost (tail's is reported), so a red run reads as green
 npm run build        # writes dist/ and regenerates index.html
 ./build.sh           # the same under `set -o pipefail`, for callers that pipe the output
-node tools/seed-e2e.mjs && node tools/e2e.mjs                 # 1023 editor checks, screenshots in /tmp/gm-e2e-*.png
+node tools/seed-e2e.mjs && node tools/e2e.mjs                 # 1027 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
@@ -232,4 +232,4 @@ widths to find click points. The **render device is not in this repo** — `/dev
 and a 1 GB `/dev/shm` come from `container.options` in the runner's own `config.yaml`, which
 applies to every job on that runner. Without them chromium falls back to llvmpipe, which gets
 WebGL 1.0 only. Measured in the job container: `ANGLE (Intel, Vulkan 1.3.230, HD Graphics 630)`,
-WebGL 2.0, and the same 1023 checks as here.
+WebGL 2.0, and the same 1027 checks as here.
diff --git a/Tilemaps.md b/Tilemaps.md
index e0b8a18..fdbf381 100644
--- a/Tilemaps.md
+++ b/Tilemaps.md
@@ -58,6 +58,15 @@ last (over the others). Per row there is:
 - its **name**, which is also how it is chosen to paint on;
 - **↑ / ↓** to move it in the drawing order and **✕** to remove it, cells and all.
 
+Below the list (#138):
+
+- **Name** renames the layer you paint on. A blank name is not taken; the field goes back to the
+  old one.
+- **Show** decides how the scene view draws the *other* layers of the selected map: **All layers**
+  as they are, **Others faded** at 30 %, or **Active layer only**. It is a way of looking while you
+  paint, not a property of the map: it touches neither the project nor the game, a map that is not
+  selected is always drawn whole, and the layer switches above stay as they are.
+
 **Add layer** appends one on top. A tilemap always keeps at least one layer — there has to be
 something to paint on.