diff --git a/Arrangement_on_surface_2/doc_tex/Arrangement_on_surface_2_ref/Arr_point_location.tex b/Arrangement_on_surface_2/doc_tex/Arrangement_on_surface_2_ref/Arr_point_location.tex
index 147ab32dd21..4c83c455654 100644
--- a/Arrangement_on_surface_2/doc_tex/Arrangement_on_surface_2_ref/Arr_point_location.tex
+++ b/Arrangement_on_surface_2/doc_tex/Arrangement_on_surface_2_ref/Arr_point_location.tex
@@ -24,7 +24,7 @@ coincide with an arrangement vertex.
 The \ccc{locate} member function used to return \ccc{CGAL::Object} up to
 \cgal{} version~3.9. Starting with \cal{} version~4.0 the return type
 is determined by a metafunction. To preserve backwards compatibility
-\ccc{CGAL::Object} can be constructed from the new return types
+\ccc{CGAL::Object} can be constructed from the new return type
 implicitly, but switching to the new style is recommended. To enable
 the old style without any overhead, the macro
 \ccc{CGAL_ARR_POINT_LOCATION_VERSION} can be defined to 1 before any
diff --git a/Arrangement_on_surface_2/doc_tex/Arrangement_on_surface_2_ref/Arr_vertical_ray_shoot.tex b/Arrangement_on_surface_2/doc_tex/Arrangement_on_surface_2_ref/Arr_vertical_ray_shoot.tex
index 96e9945aef2..ef32e1529e6 100644
--- a/Arrangement_on_surface_2/doc_tex/Arrangement_on_surface_2_ref/Arr_vertical_ray_shoot.tex
+++ b/Arrangement_on_surface_2/doc_tex/Arrangement_on_surface_2_ref/Arr_vertical_ray_shoot.tex
@@ -33,7 +33,7 @@ The \ccc{ray_shoot_up} and \ccc{ray_shoot_down} member functions used
 to return \ccc{CGAL::Object} up to \cgal{} version~3.9. Starting with
 \cal{} version~4.0 the return type is determined by a metafunction. To
 preserve backwards compatibility \ccc{CGAL::Object} can be constructed
-from the new return types implicitly, but switching to the new style
+from the new return type implicitly, but switching to the new style
 is recommended. To enable the old style without any overhead, the macro
 \ccc{CGAL_ARR_POINT_LOCATION_VERSION} can be defined to 1 before any
 \cgal{} header is included.
diff --git a/Arrangement_on_surface_2/doc_tex/Arrangement_on_surface_2_ref/arr_locate.tex b/Arrangement_on_surface_2/doc_tex/Arrangement_on_surface_2_ref/arr_locate.tex
index 2210038ee02..78e38d44337 100644
--- a/Arrangement_on_surface_2/doc_tex/Arrangement_on_surface_2_ref/arr_locate.tex
+++ b/Arrangement_on_surface_2/doc_tex/Arrangement_on_surface_2_ref/arr_locate.tex
@@ -19,7 +19,7 @@ the output sequence.
 The function \ccRefName{} used to return \ccc{CGAL::Object} up to
 \cgal{} version~3.9. Starting with \cal{} version~4.0 the return type
 is determined by a metafunction. To preserve backwards compatibility
-\ccc{CGAL::Object} can be constructed from the new return types
+\ccc{CGAL::Object} can be constructed from the new return type
 implicitly, but switching to the new style is recommended. To enable
 the old style without any overhead, the macro
 \ccc{CGAL_ARR_POINT_LOCATION_VERSION} can be defined to 1 before any