diff --git a/Device/Mask/IShape2D.h b/Device/Mask/IShape2D.h
index 6397486ce37c5b70b51c555b7745603af61ec16b..d4a7c25031a22254d10aaae7633e3fbd2e3e055e 100644
--- a/Device/Mask/IShape2D.h
+++ b/Device/Mask/IShape2D.h
@@ -3,7 +3,7 @@
 //  BornAgain: simulate and fit reflection and scattering
 //
 //! @file      Device/Mask/IShape2D.h
-//! @brief     Defines basic class for all 2D shapes.
+//! @brief     Defines and implements abstract base class for all 2D shapes.
 //!
 //! @homepage  http://www.bornagainproject.org
 //! @license   GNU General Public License v3 or higher (see COPYING)
@@ -20,7 +20,7 @@
 
 class Bin1D;
 
-//! Basic class for all shapes in 2D.
+//! Abstract base class for all shapes in 2D.
 
 class IShape2D : public ICloneable {
 public: