diff --git a/.github/CLAUDE.md b/.github/CLAUDE.md
index b5429de51..e092f6256 100644
--- a/.github/CLAUDE.md
+++ b/.github/CLAUDE.md
@@ -17,6 +17,7 @@ including the PR title format and the Go checks that CI gates on, are in the roo
 | `release-binaries.yaml` | Tag push (`v*`), manual; push to main publishes the main-latest channel when `MAIN_CHANNEL_ENABLED` is set | Release tarballs — see [Release binaries](#release-binaries) |
 | `pr-verifier.yml` | PR | PR title check |
 | `spellcheck_action.yml` | PR | Spellcheck on markdown files — **disabled** (`if: false`) |
+| `site-dispatch.yaml` | Push to main on `scripts/install.sh`, manual | Sends `docs-updated` to `rossoctl/.github`, so the site's `/cortex/install.sh` copy updates in minutes, not at its daily schedule. Needs the `SITE_DISPATCH_TOKEN` secret; without it, a warning only |
 
 Also: `release-smoke-linux.yaml`, `dependabot-tidy.yml`, `install-stats.yaml`, `project.yml`, `self-assign.yml`, `stale.yaml`.
 
diff --git a/.github/workflows/site-dispatch.yaml b/.github/workflows/site-dispatch.yaml
new file mode 100644
index 000000000..1785a9706
--- /dev/null
+++ b/.github/workflows/site-dispatch.yaml
@@ -0,0 +1,101 @@
+# Site dispatch: tell the website to rebuild when the installer changes here.
+#
+# The one-liner `curl -fsSL https://www.rossoctl.dev/cortex/install.sh | sh`
+# runs a copy of scripts/install.sh that the website in rossoctl/.github keeps.
+# Its build (npm run sync-docs) copies the file from this repository's main.
+#
+# Without this workflow, the site copies the installer only on its daily 06:17
+# UTC schedule, which GitHub can start hours late. Then a new installer option
+# fails as "unknown option" for up to a day after the merge (install.sh --praxis
+# on 2026-11-10). This workflow sends the repository_dispatch event that the
+# site's "Deploy site to Pages" workflow already listens for (type:
+# docs-updated), so the site has the new installer a few minutes after the
+# merge. rossoctl/rossoctl sends the same event for its docs.
+#
+# ONE-TIME SETUP: the secret SITE_DISPATCH_TOKEN.
+#   GITHUB_TOKEN is scoped to this repository, so it cannot dispatch to another
+#   one. Create a fine-grained personal access token, or a GitHub App token,
+#   with "Contents: read and write" on rossoctl/.github ONLY, and store it here
+#   as the repository secret SITE_DISPATCH_TOKEN:
+#
+#     gh secret set SITE_DISPATCH_TOKEN --repo rossoctl/cortex
+#
+#   Until that secret exists, this workflow gives a warning and exits 0. It
+#   does not fail a merge, and the site's daily schedule still copies the file.
+name: Site dispatch
+
+on:
+  push:
+    branches: [main]
+    paths:
+      # The only file the site copies from this repository.
+      - "scripts/install.sh"
+  workflow_dispatch: {}
+
+permissions:
+  contents: read
+
+# One dispatch at a time. A burst of merges then gives one rebuild of the site.
+concurrency:
+  group: site-dispatch
+  cancel-in-progress: false
+
+jobs:
+  dispatch:
+    name: Ask rossoctl/.github to rebuild
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - name: Send repository_dispatch to rossoctl/.github
+        id: dispatch
+        env:
+          GH_TOKEN: ${{ secrets.SITE_DISPATCH_TOKEN }}
+          SHA: ${{ github.sha }}
+          ACTOR: ${{ github.actor }}
+          RUN_URL: ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}
+        run: |
+          set -euo pipefail
+
+          if [ -z "${GH_TOKEN}" ]; then
+            echo "notified=false" >> "$GITHUB_OUTPUT"
+            msg="The website was not notified. It copies the installer on its daily 06:17 UTC"
+            msg="${msg} schedule. See the setup note in this workflow file."
+            echo "::warning title=SITE_DISPATCH_TOKEN is not set::${msg}"
+            exit 0
+          fi
+
+          echo "Dispatching docs-updated for ${SHA} to rossoctl/.github"
+
+          # The receiver is the "Deploy site to Pages" workflow in rossoctl/.github
+          # (on: repository_dispatch, types: [docs-updated]). client_payload only
+          # records which commit in this repository caused the rebuild.
+          gh api \
+            --method POST \
+            -H "Accept: application/vnd.github+json" \
+            repos/rossoctl/.github/dispatches \
+            -f event_type=docs-updated \
+            -f "client_payload[source_repo]=${GITHUB_REPOSITORY}" \
+            -f "client_payload[sha]=${SHA}" \
+            -f "client_payload[actor]=${ACTOR}" \
+            -f "client_payload[run_url]=${RUN_URL}"
+
+          echo "notified=true" >> "$GITHUB_OUTPUT"
+          echo "Dispatched. The site build runs at:"
+          echo "https://github.com/rossoctl/.github/actions/workflows/deploy.yaml"
+
+      - name: Summary
+        if: always()
+        env:
+          NOTIFIED: ${{ steps.dispatch.outputs.notified }}
+        run: |
+          {
+            echo "### Site dispatch"
+            echo ""
+            if [ "${NOTIFIED}" = "true" ]; then
+              echo "Sent \`docs-updated\` to rossoctl/.github. The site copies"
+              echo "\`scripts/install.sh\` from this commit."
+            else
+              echo "\`SITE_DISPATCH_TOKEN\` is not set, so the site was not notified."
+              echo "It copies the installer on its daily 06:17 UTC schedule."
+            fi
+          } >> "$GITHUB_STEP_SUMMARY"