diff --git a/include/wx/osx/dataview.h b/include/wx/osx/dataview.h
index 5962127d7b..b8463c4c99 100644
--- a/include/wx/osx/dataview.h
+++ b/include/wx/osx/dataview.h
@@ -174,7 +174,8 @@ public:
   virtual bool IsExpanded(const wxDataViewItem & item) const;
 
   virtual unsigned int GetCount() const;
-  virtual wxRect GetItemRect(const wxDataViewItem& item, const wxDataViewColumn* columnPtr) const;
+  virtual wxRect GetItemRect(const wxDataViewItem& item,
+                             const wxDataViewColumn* columnPtr = NULL) const;
   virtual int GetSelectedItemsCount() const;
   virtual int GetSelections(wxDataViewItemArray& sel) const;
 
diff --git a/interface/wx/dataview.h b/interface/wx/dataview.h
index c193002f53..bcd05e3cac 100644
--- a/interface/wx/dataview.h
+++ b/interface/wx/dataview.h
@@ -1098,7 +1098,18 @@ public:
     int GetIndent() const;
 
     /**
-        Returns item rect.
+        Returns item rectangle.
+
+        This method is currently not implemented at all in wxGTK and only
+        implemented for non-@NULL @a col argument in wxOSX. It is fully
+        implemented in the generic version of the control.
+
+        @param item
+            A valid item.
+        @param col
+            If non-@NULL, the rectangle returned corresponds to the
+            intersection of the item with the specified column. If @NULL, the
+            rectangle spans all the columns.
     */
     virtual wxRect GetItemRect(const wxDataViewItem& item,
                                const wxDataViewColumn* col = NULL) const;