diff --git a/tools/plan-viewer/README.md b/tools/plan-viewer/README.md
index 63bb84d..72b4fef 100644
--- a/tools/plan-viewer/README.md
+++ b/tools/plan-viewer/README.md
@@ -1,20 +1,7 @@
 ## Query Plan Viewer
 
 A static HTML viewer for `plan-runner` JSON files (the fixtures).
-It evaluates a fixture in the browser and renders the plan DAG, the input facts, the relation computed at every plan node, and a per-row comparison against `expected_bindings`.
 
 ### Usage
 
-Open [`index.html`](index.html) in a browser, then drop a fixture from `crates/plan-runner/fixtures/` onto the page or pick one with the file input.
-
-When the repository is served over HTTP (`make viewer`), a fixture can also be loaded through a query parameter:
-
-```text
-http://localhost:8000/tools/plan-viewer/index.html?fixture=../../crates/plan-runner/fixtures/two_atom_join.json
-```
-
-### Scope
-
-The viewer re-implements the operator semantics of `crates/query-ops` and `crates/plan-runner` in JavaScript, for display only.
-The Rust crates and their tests remain the correctness oracle; if the two ever disagree, the Rust behavior wins and the viewer has a bug.
-Only `scan` and `join` actions are supported.
+Open [`index.html`](index.html) in a browser, then drop a JSON file from [`crates/plan-runner/fixtures/`](../../crates/plan-runner/fixtures) onto the page.