diff --git a/meta/include/actsvg/display/grids.hpp b/meta/include/actsvg/display/grids.hpp
index c35a4f6..a8e258c 100644
--- a/meta/include/actsvg/display/grids.hpp
+++ b/meta/include/actsvg/display/grids.hpp
@@ -30,7 +30,7 @@ namespace display {
  *
  * @return an svg object representing the grid
  */
-svg::object grid(const std::string& id_, const proto::grid& g_) {
+static inline svg::object grid(const std::string& id_, const proto::grid& g_) {
 
     // The grid object
     svg::object g;
diff --git a/meta/include/actsvg/meta.hpp b/meta/include/actsvg/meta.hpp
index b3faff5..fe108c1 100644
--- a/meta/include/actsvg/meta.hpp
+++ b/meta/include/actsvg/meta.hpp
@@ -18,7 +18,8 @@
 
 #include "actsvg/styles/defaults.hpp"
 
+#include "actsvg/display/datamodel.hpp"
+#include "actsvg/display/grids.hpp"
+#include "actsvg/display/geometry.hpp"
 #include "actsvg/display/helpers.hpp"
 #include "actsvg/display/sheets.hpp"
-#include "actsvg/display/geometry.hpp"
-#include "actsvg/display/datamodel.hpp"
\ No newline at end of file
diff --git a/meta/include/actsvg/proto/grid.hpp b/meta/include/actsvg/proto/grid.hpp
index c867489..0ee73ba 100644
--- a/meta/include/actsvg/proto/grid.hpp
+++ b/meta/include/actsvg/proto/grid.hpp
@@ -41,6 +41,9 @@ struct grid {
     /// Reference r for drawing
     scalar _reference_r = 0.;
 
+    /// Bin identifications
+    std::vector<std::string> _bin_ids = {};
+
     /// Connections
     std::vector<svg::object> _connections;
     /// Connection types