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diff --git a/src/qdoc/qdoc/src/qdoc/proxynode.cpp b/src/qdoc/qdoc/src/qdoc/proxynode.cpp
new file mode 100644
index 000000000..49e4be34e
--- /dev/null
+++ b/src/qdoc/qdoc/src/qdoc/proxynode.cpp
@@ -0,0 +1,54 @@
+// Copyright (C) 2020 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include "proxynode.h"
+
+#include "tree.h"
+
+QT_BEGIN_NAMESPACE
+
+/*!
+  \class ProxyNode
+  \brief A class for representing an Aggregate that is documented in a different module.
+
+  This class is used to represent an Aggregate (usually a class)
+  that is located and documented in a different module. In the
+  current module, a ProxyNode holds child nodes that are related
+  to the class in the other module.
+
+  For example, class QHash is located and documented in QtCore.
+  There are many global functions named qHash() in QtCore that
+  are all related to class QHash using the \c relates command.
+  There are also a few qHash() function in QtNetwork that are
+  related to QHash. These functions must be documented when the
+  documentation for QtNetwork is generated, but the reference
+  page for QHash must link to that documentation in its related
+  nonmembers list.
+
+  The ProxyNode allows qdoc to construct links to the related
+  functions (or other things?) in QtNetwork from the reference
+  page in QtCore.
+ */
+
+/*!
+  Constructs the ProxyNode, which at this point looks like any
+  other Aggregate, and then finds the Tree this node is in and
+  appends this node to that Tree's proxy list so it will be
+  easy to find later.
+ */
+ProxyNode::ProxyNode(Aggregate *parent, const QString &name) : Aggregate(Node::Proxy, parent, name)
+{
+    tree()->appendProxy(this);
+}
+
+/*! \fn bool ProxyNode::docMustBeGenerated() const
+  Returns true because a ProxyNode always means some documentation
+  must be generated.
+*/
+
+/*! \fn bool ProxyNode::isRelatableType() const
+  Returns true because the ProxyNode exists so that elements
+  can be related to it with the \c {\\relates} command.
+*/
+
+QT_END_NAMESPACE