diff --git a/examples/polyscope-examples/dgtalCalculus-bunny.cpp b/examples/polyscope-examples/dgtalCalculus-bunny.cpp
index 374256b9cc..edec376ca9 100644
--- a/examples/polyscope-examples/dgtalCalculus-bunny.cpp
+++ b/examples/polyscope-examples/dgtalCalculus-bunny.cpp
@@ -19,6 +19,7 @@
  * Laboratoire d'InfoRmatique en Image et Systemes d'information - LIRIS (CNRS, UMR 5205), CNRS, France
  *
  * @date 2021/09/02
+ * @ingroup Examples
  *
  * This file is part of the DGtal library.
  */
diff --git a/examples/polyscope-examples/dgtalCalculus-geodesic.cpp b/examples/polyscope-examples/dgtalCalculus-geodesic.cpp
index 1ddb65d9fa..d73a128176 100644
--- a/examples/polyscope-examples/dgtalCalculus-geodesic.cpp
+++ b/examples/polyscope-examples/dgtalCalculus-geodesic.cpp
@@ -17,6 +17,7 @@
  * @file
  * @author David Coeurjolly (\c david.coeurjolly@liris.cnrs.fr )
  * Laboratoire d'InfoRmatique en Image et Systemes d'information - LIRIS (CNRS, UMR 5205), CNRS, France
+ * @ingroup Examples
  *
  * @date 2021/09/02
  *
diff --git a/examples/polyscope-examples/dgtalCalculus-halfsphere.cpp b/examples/polyscope-examples/dgtalCalculus-halfsphere.cpp
index 493c460ef7..5fbe31f908 100644
--- a/examples/polyscope-examples/dgtalCalculus-halfsphere.cpp
+++ b/examples/polyscope-examples/dgtalCalculus-halfsphere.cpp
@@ -19,6 +19,7 @@
  * Laboratory of Mathematics (CNRS, UMR 5127), University of Savoie, France
  *
  * @date 2022/04/10
+ * @ingroup Examples
  *
  * This file is part of the DGtal library.
  */
diff --git a/examples/polyscope-examples/dgtalCalculus-poisson.cpp b/examples/polyscope-examples/dgtalCalculus-poisson.cpp
index 56db3dec60..d410c0ddab 100644
--- a/examples/polyscope-examples/dgtalCalculus-poisson.cpp
+++ b/examples/polyscope-examples/dgtalCalculus-poisson.cpp
@@ -19,6 +19,7 @@
  * Laboratoire d'InfoRmatique en Image et Systemes d'information - LIRIS (CNRS, UMR 5205), CNRS, France
  *
  * @date 2021/09/02
+ * @ingroup Examples
  *
  * This file is part of the DGtal library.
  */
diff --git a/examples/polyscope-examples/dgtalCalculus-single.cpp b/examples/polyscope-examples/dgtalCalculus-single.cpp
index f1220b18f8..420023a723 100644
--- a/examples/polyscope-examples/dgtalCalculus-single.cpp
+++ b/examples/polyscope-examples/dgtalCalculus-single.cpp
@@ -20,6 +20,7 @@
  *
  * @date 2021/09/02
  *
+ * @ingroup Examples
  * This file is part of the DGtal library.
  */
 #include <iostream>
diff --git a/src/DGtal/dec/doc/modulePolygonalCalculus.dox b/src/DGtal/dec/doc/modulePolygonalCalculus.dox
index bb38c75c66..93d9a48091 100644
--- a/src/DGtal/dec/doc/modulePolygonalCalculus.dox
+++ b/src/DGtal/dec/doc/modulePolygonalCalculus.dox
@@ -177,7 +177,7 @@ Operator  | Output | Description
 `calculus.P(f)`|  \f$ n_f \times n_f\f$  | Projection operator acting on a discrete 1-form that removes the associated non-tangential part of the vector reconstructed using the sharp operator
 
 Discrete flat and sharp operators match with the DEC operators (see \ref moduleDECIntroduction). For short, the flat operator embeds  an ambient vector as a discrete 1-form (roughly values on the face edges) while the sharp operator pull-back a 1-form to reconstruct a vector in @f$\mathbb{R}^3@f$. These operators are rank 2 and @f$ sharp_f flat_f s = s\f$ for any vector @f$s@f$ in the face tangent plane, but  @f$ flat_f sharp_f v = v@f$ for any vector v does not hold  (due to rank deficiencies of the matrices).
-This is quantified by the projection operator @f$P@f$ (see @cite degoes2020discrete for structural lemmas, e.g. @f$ normal_f\cdot (sharp_f flat_f s)=0\quad \forall s\in$\mathbb{R}^3@f$...).
+This is quantified by the projection operator @f$P@f$ (see @cite degoes2020discrete for structural lemmas, e.g. @f$ normal_f\cdot (sharp_f flat_f s)=0\quad \forall s\in \mathbb{R}^3@f$...).
 
 
 For interested readers, @cite degoes2020discrete has a discussion about the relationship between these operators and the classical DEC or FEM ones.
diff --git a/src/DGtal/dec/doc/packageDEC.dox b/src/DGtal/dec/doc/packageDEC.dox
index f7f41a536d..2ac3f05596 100644
--- a/src/DGtal/dec/doc/packageDEC.dox
+++ b/src/DGtal/dec/doc/packageDEC.dox
@@ -75,8 +75,14 @@ Basic operators, such as Hodge duality operator or exterior derivative, can be c
 - exampleHarmonicParametrization.cpp
 - exampleVectorHeatMethod.cpp
 - dgtalCalculus-poisson.cpp
-- dgtalCalculus-laplace.cpp
+- dgtalCalculus.cpp
+- dgtalCalculus-single.cpp
+- dgtalCalculus-geodesic.cpp
+- dgtalCalculus-halfsphere.cpp
 - dgtalCalculus-bunny.cpp
+- exampleVectorHeatMethod.cpp
+- exampleHarmonicParametrization.cpp
+- exampleBunnyHead.cpp
 
 */