class="sectionbody">
<div class="paragraph">
<p>History traversing commands such as <code>git log</code> operate on a set
of commits, not just a single commit.</p>
</div>
<div class="paragraph">
<p>For these commands,
specifying a single revision, using the notation described in the
previous section, means the set of commits <code>reachable</code> from the given
commit.</p>
</div>
<div class="paragraph">
<p>A commit&#8217;s reachable set is the commit itself and the commits in
its ancestry chain.</p>
</div>