diff --git a/include/genogrove/Chroms.hpp b/include/genogrove/Chroms.hpp
new file mode 100644
index 0000000..76094b6
--- /dev/null
+++ b/include/genogrove/Chroms.hpp
@@ -0,0 +1,17 @@
+#ifndef GENOGROVE_CHROMS_HPP
+#define GENOGROVE_CHROMS_HPP
+
+// Standard
+#include <bitset>
+#include <unordered_map>
+
+class Chroms {
+    public:
+        Chroms();
+
+    private:
+        static constexpr size_t BITS = 6; // 2^6 = 64 chromosomes (should be enough for now...)
+        std::unordered_map<std::string, std::bitset<BITS>> chromsMap;
+};
+
+#endif //GENOGROVE_CHROMS_HPP