diff --git a/Distance_3/include/CGAL/Distance_3/Point_3_Triangle_3.h b/Distance_3/include/CGAL/Distance_3/Point_3_Triangle_3.h
index a6f2e7c8e94..89a75d6e9cb 100644
--- a/Distance_3/include/CGAL/Distance_3/Point_3_Triangle_3.h
+++ b/Distance_3/include/CGAL/Distance_3/Point_3_Triangle_3.h
@@ -68,8 +68,8 @@ squared_distance_to_triangle_RT(const typename K::Point_3& pt,
 
   if(normal == NULL_VECTOR)
   {
-    // The case normal==NULL_VECTOR covers the case when the triangle
-    // is colinear, or even more degenerate. In that case, we can
+    // The case normal == NULL_VECTOR covers the case when the triangle
+    // is collinear, or even more degenerate. In that case, we can
     // simply take also the distance to the three segments.
     squared_distance_RT(pt, segment(t2, t0), num, den, k);
 
@@ -161,7 +161,7 @@ squared_distance_to_triangle(const typename K::Point_3& pt,
   if(normal == NULL_VECTOR)
   {
     // The case normal == NULL_VECTOR covers the case when the triangle
-    // is colinear, or even more degenerate. In that case, we can
+    // is collinear, or even more degenerate. In that case, we can
     // simply take also the distance to the three segments.
     //
     // Note that in the degenerate case, at most 2 edges cover the full triangle,
diff --git a/Triangulation_on_sphere_2/test/Triangulation_on_sphere_2/test_dtos_traits.cpp b/Triangulation_on_sphere_2/test/Triangulation_on_sphere_2/test_dtos_traits.cpp
index a6a0d02ced8..b39f08587c4 100644
--- a/Triangulation_on_sphere_2/test/Triangulation_on_sphere_2/test_dtos_traits.cpp
+++ b/Triangulation_on_sphere_2/test/Triangulation_on_sphere_2/test_dtos_traits.cpp
@@ -74,7 +74,7 @@ int main(int, char**)
 //  result = traits.power_test_2_object()(P2, P1, P10);
 //  assert(result == CGAL::ON_NEGATIVE_SIDE);
 
-  // power_test_2(p,q) where p, q, and the center of the sphere are colinear
+  // power_test_2(p,q) where p, q, and the center of the sphere are collinear
 //  result = traits.power_test_2_object()(P1, P7);
 //  assert(result == CGAL::ON_POSITIVE_SIDE);
 //  result = traits.power_test_2_object()(P1, P1);
@@ -101,7 +101,7 @@ int main(int, char**)
 //  result = traits_6.power_test_2_object()(P14, P1, P11);
 //  assert(result == CGAL::ON_NEGATIVE_SIDE);
 
-  // power_test_2(p,q) where p, q and sphere are colinear
+  // power_test_2(p,q) where p, q and sphere are collinear
 //  result = traits_6.power_test_2_object()(P13, P0);
 //  assert(result == CGAL::ON_POSITIVE_SIDE);
 //  result = traits_6.power_test_2_object()(P13, P13);