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@@ -6653,18 +6653,17 @@ implied.</p>
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-<p>Each of the target revisions is rebased onto the parents of the root(s) of
-the target revset (not to be confused with the repo root). The children of
-the head(s) of the target revset are rebased onto the target revisions.</p>
-<p>The target revset is the union of the <code>revisions</code> arguments and must satisfy
-several conditions, otherwise the command will fail.</p>
-<ol>
-<li>The heads of the target revset must have either the same children as the
-   other heads or none.</li>
-<li>The roots of the target revset have the same parents.</li>
-<li>The parents of all target revisions except the roots must also be
-   parallelized. This means that the target revisions must be connected.</li>
-</ol>
+<p>The command effectively says "these revisions are actually independent",
+meaning that they should no longer be ancestors/descendants of each other.
+However, revisions outside the set that were previously ancestors of a
+revision in the set will remain ancestors of it. For example, revision 0
+above remains an ancestor of both 1 and 2. Similarly,
+revisions outside the set that were previously descendants of a revision
+in the set will remain descendants of it. For example, revision 3 above
+remains a descendant of both 1 and 2.</p>
+<p>Therefore, <code>jj parallelize '1 | 3'</code> is a no-op. That's because 2, which is
+not in the target set, was a descendant of 1 before, so it remains a
+descendant, and it was an ancestor of 3 before, so it remains an ancestor.</p>
 <p><strong>Usage:</strong> <code>jj parallelize [REVISIONS]...</code></p>
 <h6 id="arguments_34"><strong>Arguments:</strong><a class="headerlink" href="#arguments_34" title="Permanent link">&para;</a></h6>
 <ul>