diff --git a/README.md b/README.md
index 12fd670..e474ac9 100644
--- a/README.md
+++ b/README.md
@@ -19,6 +19,10 @@ encrypting and uploading them back to the server.
 
 ## Getting Started
 
+The commands below need git, node 22 or later, and yarn. `make install`, which
+builds the single binary that "Running the backup from cron" uses, also needs
+[nix](https://nixos.org/download).
+
 ```bash
 git clone https://git.eeqj.de/sneak/quak.git
 cd quak
@@ -86,9 +90,12 @@ enumeration/download calls) is exported too and documented under Design below.
 ## Running the backup from cron
 
 `quak backup` never prompts, so cron can run it. `make install` builds quak as a
-single binary and copies it to `~/bin/quak`. Log in once with it, as the user
-the cron job will run as; the session is saved in that user's data directory
-(see "Session handling"):
+single binary and copies it to `~/bin/quak`. Besides what Getting Started needs,
+it needs [nix](https://nixos.org/download), even where bun is already installed:
+`make install` runs `make build-bin`, which bundles the built `dist/` with bun
+run through `nix-shell -p bun`. Log in once with `~/bin/quak`, as the user the
+cron job will run as; the session is saved in that user's data directory (see
+"Session handling"):
 
 ```bash
 ~/bin/quak login
diff --git a/TODO.md b/TODO.md
index 1aa7f9b..f077269 100644
--- a/TODO.md
+++ b/TODO.md
@@ -17,7 +17,10 @@ pre-1.0
 
 # Next Step
 
-None: no implementation work is open. The check of quak against a live Ente
+Four bugs are open: https://git.eeqj.de/sneak/quak/issues/196,
+https://git.eeqj.de/sneak/quak/issues/197,
+https://git.eeqj.de/sneak/quak/issues/198 and
+https://git.eeqj.de/sneak/quak/issues/199. The check of quak against a live Ente
 account, https://git.eeqj.de/sneak/quak/issues/187, needs an account only sneak
 has, so it waits on him.
 
@@ -26,6 +29,10 @@ declares one.
 
 # Completed Steps
 
+- 2026-10-15: The README says that `make install` needs nix (issue 200), in
+  Getting Started and in "Running the backup from cron": `make build-bin` runs
+  bun through `nix-shell -p bun`. The `Makefile` is unchanged.
+
 - 2026-10-14: `lib.backup()`, and so `quak backup`, works on up to the content
   pool's limit of originals at once, 5 by default, instead of one at a time
   (issue 182). That many workers take files from one shared list, each doing all