diff --git a/Kernel_23/doc_tex/Kernel_23_ref/Kernel_ConstructNormal_3.tex b/Kernel_23/doc_tex/Kernel_23_ref/Kernel_ConstructNormal_3.tex
new file mode 100755
index 00000000000..21e1f4f4c16
--- /dev/null
+++ b/Kernel_23/doc_tex/Kernel_23_ref/Kernel_ConstructNormal_3.tex
@@ -0,0 +1,18 @@
+\begin{ccRefFunctionObjectConcept}{Kernel::ConstructNormal_3}
+A model for this must provide:
+
+\ccCreationVariable{fo}
+
+\ccMemberFunction{Kernel::Vector_3 operator()(const Kernel::Point_3& p,
+                                             const Kernel::Point_3& q,
+                                             const Kernel::Point_3& r );}
+ {computes the normal of the vectors\ccc{q-p} and \ccc{r-p}.}
+
+\ccRefines
+\ccc{AdaptableFunctor} (with three arguments)
+
+\ccSeeAlso
+\ccRefIdfierPage{CGAL::normal} \\
+\ccRefIdfierPage{CGAL::unit_normal} \\
+
+\end{ccRefFunctionObjectConcept}
diff --git a/Kernel_23/doc_tex/Kernel_23_ref/Kernel_ConstructUnitNormal_3.tex b/Kernel_23/doc_tex/Kernel_23_ref/Kernel_ConstructUnitNormal_3.tex
new file mode 100755
index 00000000000..8b337dc72fd
--- /dev/null
+++ b/Kernel_23/doc_tex/Kernel_23_ref/Kernel_ConstructUnitNormal_3.tex
@@ -0,0 +1,17 @@
+\begin{ccRefFunctionObjectConcept}{Kernel::ConstructUnitNormal_3}
+A model for this must provide:
+
+\ccCreationVariable{fo}
+
+\ccMemberFunction{Kernel::Vector_3 operator()(const Kernel::Point_3& p,
+                                             const Kernel::Point_3& q,
+                                             const Kernel::Point_3& r );}
+ {computes the unit normal of the vectors\ccc{q-p} and \ccc{r-p}.}
+
+\ccRefines
+\ccc{AdaptableFunctor} (with three arguments)
+
+\ccSeeAlso
+\ccRefIdfierPage{CGAL::normal} \\
+\ccRefIdfierPage{CGAL::unit_normal} \\
+\end{ccRefFunctionObjectConcept}