diff --git a/test.php.md b/test.php.md
index 3a5f153..c48c4c2 100644
--- a/test.php.md
+++ b/test.php.md
@@ -53,7 +53,7 @@ Or open `test.php`, load sample or live data, then click **Load forecast**.
 |-----------|---------|--------|
 | `sample=1` | `?sample=1` | Use sample JS; no live fetch |
 | `forecast=1` | `?forecast=1` | Auto-load `forecast_output.json` |
-| `interval=N` | `?interval=24` | Live trend window (8–72 hours) |
+| `interval=N` | `?interval=24` | Live trend window (8-36 hours) |
 | `keyid=N` | `?keyid=1` | Override automation-server id |
 | `embed=1` | `?embed=1` | Minimal header (iframe) |