diff --git a/include/aidge/data/Database.hpp b/include/aidge/data/Database.hpp
index 04aa008a1d0f850e1a18e965fd107391723ce25c..cfea403d3b49cb1a483e7a2cbca7a8f31617eba9 100644
--- a/include/aidge/data/Database.hpp
+++ b/include/aidge/data/Database.hpp
@@ -33,6 +33,13 @@ public:
      */
     virtual std::size_t getLen() = 0;
 
+    /**
+     * @brief Get the number of modalities in one database item
+     * 
+     * @return std::size_t 
+     */
+    virtual std::size_t getNbModalities() = 0;
+
 };
 } // namespace Aidge