diff --git a/src/tools/qdoc/helpprojectwriter.cpp b/src/tools/qdoc/helpprojectwriter.cpp
index e71ce5946b..98ebcd81c2 100644
--- a/src/tools/qdoc/helpprojectwriter.cpp
+++ b/src/tools/qdoc/helpprojectwriter.cpp
@@ -39,6 +39,8 @@
 **
 ****************************************************************************/
 
+#include <QCryptographicHash>
+#include <QDebug>
 #include <QHash>
 #include <QMap>
 
@@ -48,7 +50,6 @@
 #include "config.h"
 #include "node.h"
 #include "tree.h"
-#include <qdebug.h>
 
 QT_BEGIN_NAMESPACE
 
@@ -461,6 +462,19 @@ void HelpProjectWriter::generate(const Tree *t)
         generateProject(projects[i]);
 }
 
+void HelpProjectWriter::writeHashFile(QFile &file)
+{
+    QCryptographicHash hash(QCryptographicHash::Sha1);
+    hash.addData(&file);
+
+    QFile hashFile(file.fileName() + ".sha1");
+    if (!hashFile.open(QFile::WriteOnly | QFile::Text))
+        return;
+
+    hashFile.write(hash.result().toHex());
+    hashFile.close();
+}
+
 void HelpProjectWriter::writeNode(HelpProject &project, QXmlStreamWriter &writer,
                                   const Node *node)
 {
@@ -751,6 +765,7 @@ void HelpProjectWriter::generateProject(HelpProject &project)
     writer.writeEndElement(); // filterSection
     writer.writeEndElement(); // QtHelpProject
     writer.writeEndDocument();
+    writeHashFile(file);
     file.close();
 }
 
diff --git a/src/tools/qdoc/helpprojectwriter.h b/src/tools/qdoc/helpprojectwriter.h
index ac813525e0..a628dbc016 100644
--- a/src/tools/qdoc/helpprojectwriter.h
+++ b/src/tools/qdoc/helpprojectwriter.h
@@ -101,6 +101,7 @@ private:
     bool generateSection(HelpProject &project, QXmlStreamWriter &writer,
                          const Node *node);
     QStringList keywordDetails(const Node *node) const;
+    void writeHashFile(QFile &file);
     void writeNode(HelpProject &project, QXmlStreamWriter &writer, const Node *node);
     void readSelectors(SubProject &subproject, const QStringList &selectors);
 
diff --git a/src/tools/qdoc/qdoc.pro b/src/tools/qdoc/qdoc.pro
index abd256c60d..e05d9ea2af 100644
--- a/src/tools/qdoc/qdoc.pro
+++ b/src/tools/qdoc/qdoc.pro
@@ -73,6 +73,7 @@ SOURCES += atom.cpp \
            tokenizer.cpp \
            tree.cpp \
            yyindent.cpp \
+           ../../corelib/tools/qcryptographichash.cpp \
            ../../xml/dom/qdom.cpp \
            ../../xml/sax/qxml.cpp