[mike@mwxm4]

README.md

@@ -28,6 +28,20 @@ version from `main.go`.
 `../t/corpus`, the same corpus `t/select.t` uses, and fails if the two
 implementations start disagreeing.
 
+## The first one
+
+`upd --update` needs an upd to run it. `loadupd.sh` fetches that first one -
+POSIX sh, curl or wget, no upd required:
+
+```sh
+./loadupd.sh              # into the current directory
+./loadupd.sh ~/bin        # into a directory of your choosing
+```
+
+It reads the newest release, picks the asset matching `uname -s`/`uname -m`,
+runs it once before putting it in place, and says if the directory is not in
+`$PATH`. `$UPD_REPO_URL` points it at a mirror. From there on upd takes over.
+
 ## Updating itself
 
 upd installs itself the same way it installs everything else - same forge