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+<p>
+    LEAN CLI updates two files in the <span class='public-directory-name'>data</span> directory daily:
+</p>
+<ul>
+    <li><span class='public-file-name'>data/market-hours/market-hours-database.json</span></li>
+    <li><span class='public-file-name'>data/symbol-properties/symbol-properties-database.csv</span></li>
+</ul>
+<p>
+    These files contains <a href="/docs/v2/writing-algorithms/securities/exchange">exchange market hours</a> and <a href="/docs/v2/writing-algorithms/securities/properties#50-Symbol-Properties">symbol properties</a> data.
+</p>
+
+<p>
+    To disable the updates, open the <span class="public-file-name">lean.json</span> file and set the <code>file-database-last-update</code> value to a date in the future.
+</p>
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