--- a/src/xslt.cpp
+++ b/src/xslt.cpp
@@ -482,5 +482,10 @@ QStringList getKDocToolsCatalogs()
 QStringList KDocTools::documentationDirs()
 {
     /* List of paths containing documentation */
-    return QStandardPaths::locateAll(QStandardPaths::GenericDataLocation, QStringLiteral("doc/HTML"), QStandardPaths::LocateDirectory);
+    QStringList doc_dirs(QStandardPaths::locateAll(QStandardPaths::GenericDataLocation, QStringLiteral("doc/HTML"), QStandardPaths::LocateDirectory));
+    if( !doc_dirs.contains(QStringLiteral("/usr/share/kf5/doc/HTML")) )
+        doc_dirs.append("/usr/share/kf5/doc/HTML");
+    if( !doc_dirs.contains(QStringLiteral("/usr/share/kde4/doc/HTML")) )
+        doc_dirs.append("/usr/share/kde4/doc/HTML");
+    return doc_dirs;
 }