diff --git a/README.md b/README.md
index e24631a..981cff0 100644
--- a/README.md
+++ b/README.md
@@ -55,7 +55,7 @@ pnpm build      # production bundle
 pnpm harness    # headless balance run
 ```
 
-Node 22 or newer.
+Node 22 or newer. On Node 26, run checks with `NODE_OPTIONS=--no-experimental-webstorage pnpm check` so Node's experimental `localStorage` does not mask jsdom's implementation.
 
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