diff --git a/include/boost/geometry/algorithms/detail/is_valid/polygon.hpp b/include/boost/geometry/algorithms/detail/is_valid/polygon.hpp
index 00846d735..17eefd226 100644
--- a/include/boost/geometry/algorithms/detail/is_valid/polygon.hpp
+++ b/include/boost/geometry/algorithms/detail/is_valid/polygon.hpp
@@ -129,7 +129,7 @@ protected:
     };
 
 
-    // structs from partition -- start
+    // structs for partition -- start
     struct expand_box
     {
         template <typename Box, typename Iterator>