diff --git a/Basic_viewer/include/CGAL/Qt/Basic_viewer.h b/Basic_viewer/include/CGAL/Qt/Basic_viewer.h
index d7e3dcd48ccc..23c1781055bc 100644
--- a/Basic_viewer/include/CGAL/Qt/Basic_viewer.h
+++ b/Basic_viewer/include/CGAL/Qt/Basic_viewer.h
@@ -986,7 +986,7 @@ class Basic_viewer : public CGAL::QGLViewer
       if (!rendering_program_sphere.addShader(geometry_shader_sphere))
       { std::cerr << "Adding geometry shader for sphere FAILED" << std::endl;}
       if (!rendering_program_sphere.addShader(fragment_shader_sphere))
-      { std::cerr << "Adding fragment shader for clipping plane FAILED" << std::endl; }
+      { std::cerr << "Adding fragment shader for sphere FAILED" << std::endl; }
       if (!rendering_program_sphere.link())
       { std::cerr << "Linking Program for sphere FAILED" << std::endl; }
     }
@@ -994,7 +994,6 @@ class Basic_viewer : public CGAL::QGLViewer
     // Cylinder shader
     if (isOpenGL_4_3())
     {
-      // clipping plane shader
       source_ = VERTEX_SOURCE_SHAPE;
 
       QOpenGLShader *vertex_shader_cylinder = new QOpenGLShader(QOpenGLShader::Vertex);
@@ -1019,7 +1018,7 @@ class Basic_viewer : public CGAL::QGLViewer
       if (!rendering_program_cylinder.addShader(geometry_shader_cylinder))
       { std::cerr << "Adding geometry shader for cylinder FAILED" << std::endl;}
       if (!rendering_program_cylinder.addShader(fragment_shader_cylinder))
-      { std::cerr << "Adding fragment shader for clipping plane FAILED" << std::endl; }
+      { std::cerr << "Adding fragment shader for cylinder FAILED" << std::endl; }
       if (!rendering_program_cylinder.link())
       { std::cerr << "Linking Program for cylinder FAILED" << std::endl; }
     }
@@ -1051,12 +1050,12 @@ class Basic_viewer : public CGAL::QGLViewer
       if (!rendering_program_normal.addShader(geometry_shader_normal))
       { std::cerr << "Adding geometry shader for normal FAILED" << std::endl;}
       if (!rendering_program_normal.addShader(fragment_shader_normal))
-      { std::cerr << "Adding fragment shader for clipping plane FAILED" << std::endl; }
+      { std::cerr << "Adding fragment shader for normal FAILED" << std::endl; }
       if (!rendering_program_normal.link())
       { std::cerr << "Linking Program for normal FAILED" << std::endl; }
     }
 
-    // Normal shader
+    // Triangle shader
     if (isOpenGL_4_3())
     {
       source_ = VERTEX_SOURCE_TRIANGLE;
@@ -1083,7 +1082,7 @@ class Basic_viewer : public CGAL::QGLViewer
       if (!rendering_program_triangle.addShader(geometry_shader_triangle))
       { std::cerr << "Adding geometry shader for triangle FAILED" << std::endl;}
       if (!rendering_program_triangle.addShader(fragment_shader_triangle))
-      { std::cerr << "Adding fragment shader for clipping plane FAILED" << std::endl; }
+      { std::cerr << "Adding fragment shader for triangle FAILED" << std::endl; }
       if (!rendering_program_triangle.link())
       { std::cerr << "Linking Program for triangle FAILED" << std::endl; }
     }