diff --git a/examples/object-oriented-cpp/Makefile b/examples/object-oriented-cpp/Makefile
index af948c23..bbcd2ffb 100644
--- a/examples/object-oriented-cpp/Makefile
+++ b/examples/object-oriented-cpp/Makefile
@@ -3,7 +3,7 @@ CXXFLAGS = -std=c++11 -Wall -Wextra -O3
 PINEAPPL_DEPS != pkg-config --cflags --libs pineappl_capi
 LHAPDF_DEPS != pkg-config --cflags --libs lhapdf
 
-dyaa: dyaa.cpp PineAPPL.hpp
+dyaa: dyaa.cpp
 	$(CXX) $(CXXFLAGS) $< $(PINEAPPL_DEPS) $(LHAPDF_DEPS) -o $@
 
 PHONY: clean
diff --git a/pineappl_capi/Cargo.toml b/pineappl_capi/Cargo.toml
index 09fce3d5..8bb2fa96 100644
--- a/pineappl_capi/Cargo.toml
+++ b/pineappl_capi/Cargo.toml
@@ -20,4 +20,7 @@ itertools = "0.10.1"
 capi = []
 
 [package.metadata.capi]
-min_version = "0.6.16+cargo-0.45"
+min_version = "0.9.0"
+
+[package.metadata.capi.install.include]
+asset = [{from = "include/PineAPPL.hpp"}]
diff --git a/examples/object-oriented-cpp/PineAPPL.hpp b/pineappl_capi/include/PineAPPL.hpp
similarity index 84%
rename from examples/object-oriented-cpp/PineAPPL.hpp
rename to pineappl_capi/include/PineAPPL.hpp
index f27dbb9f..56123711 100644
--- a/examples/object-oriented-cpp/PineAPPL.hpp
+++ b/pineappl_capi/include/PineAPPL.hpp
@@ -1,6 +1,5 @@
 /**
- * @file PineAPPL.hpp
- * @brief object oriented interface to PineAPPL
+ * @brief Object oriented interface to PineAPPL.
  */
 #ifndef PineAPPL_HPP_
 #define PineAPPL_HPP_
@@ -13,16 +12,16 @@
 #include <memory>
 #include <algorithm>
 
-/** @brief object oriented interface to PineAPPL  */
+/** @brief Object oriented interface to PineAPPL.  */
 namespace PineAPPL {
 
 /** @brief Key-value storage for passing optional information during grid
- * creation */
+ * creation. */
 struct KeyVal {
-  /** @brief underlying raw object */
+  /** @brief Underlying raw object. */
   pineappl_keyval *raw;
 
-  /** @brief constructor */
+  /** @brief Constructor. */
   KeyVal() : raw(pineappl_keyval_new()) {}
 
   KeyVal(const KeyVal &) = delete;
@@ -33,10 +32,10 @@ struct KeyVal {
 
   KeyVal &operator=(KeyVal &&) = delete;
 
-  /** @brief destructor */
+  /** @brief Destructor. */
   ~KeyVal() { pineappl_keyval_delete(this->raw); }
 
-  /** @name setter */
+  /** @name Setter. */
   ///@{
   void set_double(const std::string &key, const double value) const {
     pineappl_keyval_set_double(this->raw, key.c_str(), value);
@@ -52,7 +51,7 @@ struct KeyVal {
   }
   ///@}
 
-  /** @name getter */
+  /** @name Getter. */
   ///@{
   double get_double(const std::string &key) const {
     return pineappl_keyval_double(this->raw, key.c_str());
@@ -69,24 +68,24 @@ struct KeyVal {
   ///@}
 };
 
-/** @brief Entry in luminosity function  */
+/** @brief Entry in luminosity function.  */
 struct LumiEntry {
-  /** @brief first parton id */
+  /** @brief First parton id. */
   std::int32_t pid1;
 
-  /** @brief second parton id */
+  /** @brief Second parton id. */
   std::int32_t pid2;
 
-  /** @brief relative weight */
+  /** @brief Relative weight. */
   double weight;
 };
 
-/** @brief Luminosity function */
+/** @brief Luminosity function. */
 struct Lumi {
-  /** @brief underlying raw object */
+  /** @brief Underlying raw object. */
   pineappl_lumi *raw;
 
-  /** @brief constructor */
+  /** @brief Constructor. */
   Lumi() : raw(pineappl_lumi_new()) {}
 
   Lumi(const Lumi &) = delete;
@@ -97,14 +96,14 @@ struct Lumi {
 
   Lumi &operator=(Lumi &&) = delete;
 
-  /** @brief destructor */
+  /** @brief Destructor. */
   ~Lumi() { pineappl_lumi_delete(this->raw); }
 
-  /** @brief number of elements */
+  /** @brief Number of elements. */
   std::size_t count() const { return pineappl_lumi_count(this->raw); }
 
   /**
-   * @brief add a luminosity function
+   * @brief Add a luminosity function.
    * @param c luminosity function
    */
   void add(const std::vector<LumiEntry> &c) const {
@@ -146,13 +145,14 @@ struct Order {
   std::uint32_t logxif;
 };
 
+/** @brief The central grid object. */
 struct Grid {
 
-  /** @brief underlying raw object */
+  /** @brief Underlying raw object. */
   pineappl_grid *raw;
 
   /**
-   * @brief constructor
+   * @brief Constructor.
    * @param lumi luminosity
    * @param orders orders
    * @param bin_limits bin limits
@@ -184,11 +184,11 @@ struct Grid {
 
   Grid &operator=(Grid &&) = delete;
 
-  /** @brief destructor */
+  /** @brief Destructor. */
   ~Grid() { pineappl_grid_delete(this->raw); }
 
   /**
-   * @brief Number of orders
+   * @brief Number of orders.
    * @return number of orders
    */
   std::size_t order_count() const {
@@ -196,13 +196,13 @@ struct Grid {
   }
 
   /**
-   * @brief Number of bins
+   * @brief Number of bins.
    * @return number of bins
    */
   std::size_t bin_count() const { return pineappl_grid_bin_count(this->raw); }
 
   /**
-   * @brief Fill grid for the given parameters
+   * @brief Fill grid for the given parameters.
    * @param x1 first momentum fraction
    * @param x2 second momentum fraction
    * @param q2 scale
@@ -218,7 +218,7 @@ struct Grid {
   }
 
   /**
-   * @brief perform a convolution of the grid with PDFs
+   * @brief Perform a convolution of the grid with PDFs.
    * @param pdg_id hadron ID
    * @param pdf PDF
    * @param xi_ren renormalization scale variation
@@ -260,7 +260,7 @@ struct Grid {
   }
 
   /**
-   * @brief Write grid to file
+   * @brief Write grid to file.
    * @param filename file name
    */
   void write(const std::string &filename) const {
@@ -268,7 +268,7 @@ struct Grid {
   }
 
   /**
-   * @brief Set a metadata entry
+   * @brief Set a metadata entry.
    * @param key key
    * @param value value
    */
@@ -277,7 +277,7 @@ struct Grid {
   }
 
   /**
-   * @brief Get a metadata entry
+   * @brief Get a metadata entry.
    * @param key key
    * @return value
    */
@@ -288,6 +288,22 @@ struct Grid {
     pineappl_string_delete(value);
     return res;
   }
+
+  /**
+   * @brief Scale grid with a number.
+   * This multiplies all subgrids with the given number.
+   * @param s factor
+   */
+  void scale(const double s) const {
+    pineappl_grid_scale(this->raw, s);
+  }
+
+  /**
+   * @brief Optimizes the grid representation for space efficiency.
+   */
+  void optimize() const {
+    pineappl_grid_optimize(this->raw);
+  }
 };
 
 } // namespace PineAPPL