diff --git a/src/gui/editorwidgets/qgsexternalresourcewidgetwrapper.h b/src/gui/editorwidgets/qgsexternalresourcewidgetwrapper.h
index d36ef32825a9..581f6840a278 100644
--- a/src/gui/editorwidgets/qgsexternalresourcewidgetwrapper.h
+++ b/src/gui/editorwidgets/qgsexternalresourcewidgetwrapper.h
@@ -30,14 +30,15 @@ class QLineEdit;
  * \note not available in Python bindings
  */
 
+/**
+ * @brief The QgsExternalResourceWidgetWrapper class wraps a external resource widget
+ */
 class GUI_EXPORT QgsExternalResourceWidgetWrapper : public QgsEditorWidgetWrapper
 {
     Q_OBJECT
   public:
     explicit QgsExternalResourceWidgetWrapper( QgsVectorLayer* vl, int fieldIdx, QWidget* editor = nullptr, QWidget* parent = nullptr );
 
-
-
     // QgsEditorWidgetWrapper interface
   public:
     QVariant value() const override;
diff --git a/src/gui/qgsexternalresourcewidget.h b/src/gui/qgsexternalresourcewidget.h
index 7ced67757bdd..e6308009593f 100644
--- a/src/gui/qgsexternalresourcewidget.h
+++ b/src/gui/qgsexternalresourcewidget.h
@@ -30,7 +30,7 @@ class QgsPixmapLabel;
 
 /** \ingroup gui
  * Widget to display file path with a push button for an "open file" dialog
- * It can also be used to display a picture.
+ * It can also be used to display a picture or a web page.
  **/
 class GUI_EXPORT QgsExternalResourceWidget : public QWidget
 {
@@ -49,6 +49,11 @@ class GUI_EXPORT QgsExternalResourceWidget : public QWidget
       Web
     };
 
+    /**
+     * @brief QgsExternalResourceWidget creates a widget with a file picker and a document viewer
+     * Both part of the widget are optional.
+     * @see QgsFilePickerwidget
+     */
     explicit QgsExternalResourceWidget( QWidget *parent = 0 );
 
     /**
@@ -71,16 +76,26 @@ class GUI_EXPORT QgsExternalResourceWidget : public QWidget
     //! setDocumentViewerContent defines the type of content to be shown. Widget will be adapated accordingly
     void setDocumentViewerContent( QgsExternalResourceWidget::DocumentViewerContent content );
 
-    //! set the configuration of the document viewer
+    //! returns the height of the document viewer
     int documentViewerHeight() const;
+    /**
+     * @brief setDocumentViewerWidth set the height of the document viewer.
+     * @param height the height. Use 0 for automatic best display.
+     */
     void setDocumentViewerHeight( int height );
+    //! returns the width of the document viewer
     int documentViewerWidth() const ;
+    /**
+     * @brief setDocumentViewerWidth set the width of the document viewer.
+     * @param width the width. Use 0 for automatic best display.
+     */
     void setDocumentViewerWidth( int width );
 
     //! defines if the widget is readonly
     void setReadOnly( bool readOnly );
 
   signals:
+    //! emitteed as soon as the current document changes
     void valueChanged( QString );
 
   private slots:
diff --git a/src/gui/qgsfilepickerwidget.h b/src/gui/qgsfilepickerwidget.h
index 3399d1257a92..35cfe4e4e2a7 100644
--- a/src/gui/qgsfilepickerwidget.h
+++ b/src/gui/qgsfilepickerwidget.h
@@ -25,6 +25,9 @@ class QgsFilterLineEdit;
 
 #include <QWidget>
 
+/**
+ * @brief The QgsFilePickerWidget class creates a widget for selecting a file or a folder.
+ */
 class GUI_EXPORT QgsFilePickerWidget : public QWidget
 {
     Q_OBJECT
@@ -37,12 +40,18 @@ class GUI_EXPORT QgsFilePickerWidget : public QWidget
     Q_PROPERTY( RelativeStorage relativeStorage READ relativeStorage WRITE setRelativeStorage )
 
   public:
+    /**
+     * @brief The StorageMode enum determines if the file picker should pick files or directories
+     */
     enum StorageMode
     {
       File,
       Directory
     };
 
+    /**
+     * @brief The RelativeStorage enum determines if path is absolute, relative to the current project path or relative to a defined default path.
+     */
     enum RelativeStorage
     {
       Absolute,
@@ -50,6 +59,9 @@ class GUI_EXPORT QgsFilePickerWidget : public QWidget
       RelativeDefaultPath
     };
 
+    /**
+     * @brief QgsFilePickerWidget creates a widget for selecting a file or a folder.
+     */
     explicit QgsFilePickerWidget( QWidget *parent = 0 );
 
     ~QgsFilePickerWidget();
@@ -81,23 +93,28 @@ class GUI_EXPORT QgsFilePickerWidget : public QWidget
     //! determines if the file path will be shown as a link
     void setUseLink( bool useLink );
 
-    //! determines if the links shows the full path or not
+    //! returns if the links shows the full path or not
     bool fullUrl() const;
+    //! determines if the links shows the full path or not
     void setFullUrl( bool fullUrl );
 
-    //! determinies the default root path
+    //! returns the default root path
     QString defaultRoot() const;
+    //! determines the default root path used as the first shown location when picking a file and used if the RelativeStorage is RelativeDefaultPath
     void setDefaultRoot( QString defaultRoot );
 
-    //! determines the storage mode (i.e. file or directory)
+    //! returns the storage mode (i.e. file or directory)
     QgsFilePickerWidget::StorageMode storageMode() const;
+    //! determines the storage mode (i.e. file or directory)
     void setStorageMode( QgsFilePickerWidget::StorageMode storageMode );
 
-    //! determines if the relative path is with respect to the project path or the default path
+    //! returns if the relative path is with respect to the project path or the default path
     QgsFilePickerWidget::RelativeStorage relativeStorage() const;
+    //! determines if the relative path is with respect to the project path or the default path
     void setRelativeStorage( QgsFilePickerWidget::RelativeStorage relativeStorage );
 
   signals:
+    //! emitted as soon as the current file or directory is changed
     void fileChanged( QString );
 
   private slots: