Update README.md

Author: siyuanZHANG01

docs/README.md

@@ -8,6 +8,8 @@ Interactive visualization of U.S. vessel traffic for five major ports, built on
 
 The site is a fully static SPA — no build step required.
 
+🌐 The webpage is available at: https://com-480-data-visualization.github.io/DataVision2/
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 ## Data
@@ -22,7 +24,7 @@ The raw Parquet files are not included due to size. Pre-processed JSON files are
 
 - **Global view** — 60,000 sampled trajectories colored by speed. Use the date picker, time slider, and vessel type filter to narrow the dataset.
 - **Port view** — click a port marker or sidebar entry to zoom in and see activity charts, fleet breakdown, and anchor zones.
-- **Compare** — select a second port from the "Compare with" dropdown to view side-by-side charts.
+- **Compare** — Zoom in a port and select a second port from the "Compare with" dropdown to view side-by-side charts.
 - **▶ Time / ▶ Months** — animate through the day or the year.
 
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