diff --git a/python/core/auto_generated/qgsdataitem.sip.in b/python/core/auto_generated/qgsdataitem.sip.in
index 83a3b905def..73cab169073 100644
--- a/python/core/auto_generated/qgsdataitem.sip.in
+++ b/python/core/auto_generated/qgsdataitem.sip.in
@@ -533,8 +533,19 @@ A Collection: logical collection of layers or subcollections, e.g. GRASS locatio
 
     void addChild( QgsDataItem *item /Transfer/ );
 
-    static QIcon iconDir(); // shared icon: open/closed directory
-    static QIcon iconDataCollection(); // default icon for data collection
+    static QIcon iconDir();
+%Docstring
+Returns the standard browser directory icon.
+
+.. seealso:: :py:func:`iconDataCollection`
+%End
+
+    static QIcon iconDataCollection();
+%Docstring
+Returns the standard browser data collection icon.
+
+.. seealso:: :py:func:`iconDir`
+%End
 
   protected:
 
@@ -593,6 +604,10 @@ Constructor.
 
 
     QString dirPath() const;
+%Docstring
+Returns the full path to the directory the item represents.
+%End
+
     virtual bool equal( const QgsDataItem *other );
 
     virtual QIcon icon();
diff --git a/python/core/auto_generated/qgsmimedatautils.sip.in b/python/core/auto_generated/qgsmimedatautils.sip.in
index 8ac5917b5a7..ba1042e8437 100644
--- a/python/core/auto_generated/qgsmimedatautils.sip.in
+++ b/python/core/auto_generated/qgsmimedatautils.sip.in
@@ -67,6 +67,7 @@ Gets mesh layer from uri if possible, otherwise returns None and error is set
       QString layerType;
 
       QString providerKey;
+
       QString name;
       QString uri;
       QStringList supportedCrs;
diff --git a/src/core/qgsdataitem.h b/src/core/qgsdataitem.h
index c02a3c42b5e..31ea5b77d4f 100644
--- a/src/core/qgsdataitem.h
+++ b/src/core/qgsdataitem.h
@@ -556,8 +556,17 @@ class CORE_EXPORT QgsDataCollectionItem : public QgsDataItem
 
     void addChild( QgsDataItem *item SIP_TRANSFER ) { mChildren.append( item ); }
 
-    static QIcon iconDir(); // shared icon: open/closed directory
-    static QIcon iconDataCollection(); // default icon for data collection
+    /**
+     * Returns the standard browser directory icon.
+     * \see iconDataCollection()
+     */
+    static QIcon iconDir();
+
+    /**
+     * Returns the standard browser data collection icon.
+     * \see iconDir()
+     */
+    static QIcon iconDataCollection();
 
   protected:
 
@@ -607,7 +616,11 @@ class CORE_EXPORT QgsDirectoryItem : public QgsDataCollectionItem
 
     QVector<QgsDataItem *> createChildren() override;
 
+    /**
+     * Returns the full path to the directory the item represents.
+     */
     QString dirPath() const { return mDirPath; }
+
     bool equal( const QgsDataItem *other ) override;
     QIcon icon() override;
     QWidget *paramWidget() override SIP_FACTORY;
diff --git a/src/core/qgsmimedatautils.h b/src/core/qgsmimedatautils.h
index 9f5a67b5311..7c83c8446e6 100644
--- a/src/core/qgsmimedatautils.h
+++ b/src/core/qgsmimedatautils.h
@@ -72,16 +72,30 @@ class CORE_EXPORT QgsMimeDataUtils
        */
       QgsMeshLayer *meshLayer( bool &owner, QString &error ) const;
 
-      //! Type of URI. Recognized types: "vector" / "raster" / "mesh" / "plugin" / "custom" / "project"
+      /**
+       * Type of URI.
+       *
+       * Recognized types include
+       * - "vector": vector layers
+       * - "raster": raster layers
+       * - "mesh": mesh layers
+       * - "plugin": plugin layers
+       * - "custom": custom types
+       * - "project": QGS/QGZ project file
+       * - "directory": directory path
+       *
+       * Mime data from plugins may use additional custom layer types.
+       */
       QString layerType;
 
       /**
        * For "vector" / "raster" type: provider id.
        * For "plugin" type: plugin layer type name.
        * For "custom" type: key of its QgsCustomDropHandler
-       * For "project" type: unused
+       * For "project" and "directory" types: unused
        */
       QString providerKey;
+
       //! Human readable name to be used e.g. in layer tree
       QString name;
       //! Identifier of the data source recognized by its providerKey