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@@ -354,6 +354,8 @@ <h2 id="updating-hooks-automatically">    Updating hooks automatically <small><a
 installable package (gem, npm, pypi, etc.) or exposes an executable, it can be
 used with pre-commit. Each git repo can support as many languages/hooks as you
 want.</p>
+<p><em>new in 2.5.0</em>: <code>pre-commit</code> sets the <code>PRE_COMMIT=1</code> environment variable
+during hook execution.</p>
 <p>The hook must exit nonzero on failure or modify files.</p>
 <p>A git repo containing pre-commit plugins must contain a <code>.pre-commit-hooks.yaml</code>
 file that tells pre-commit:</p>