diff --git a/include/xo/expression2/StringTable.hpp b/include/xo/expression2/StringTable.hpp
index 471fbc0d..b55c48ee 100644
--- a/include/xo/expression2/StringTable.hpp
+++ b/include/xo/expression2/StringTable.hpp
@@ -21,6 +21,7 @@ namespace xo {
         class StringTable {
         public:
             using DArena = xo::mm::DArena;
+            using MemorySizeInfo = xo::mm::MemorySizeInfo;
             using StringMap = xo::map::DArenaHashMap<std::string_view,
                                                      DUniqueString*>;
             using size_type = StringMap::size_type;
@@ -45,6 +46,9 @@ namespace xo {
              **/
             bool verify_ok(verify_policy p = verify_policy::throw_only()) const;
 
+            std::size_t _n_store() const noexcept;
+            MemorySizeInfo _store_info(std::size_t i) const noexcept;
+
         private:
             /** allocate string storage in this arena; use DString to represent each string.
              *  Can't use DArenaVector b/c DString has variable size
diff --git a/src/expression2/StringTable.cpp b/src/expression2/StringTable.cpp
index f59bb24d..79a17067 100644
--- a/src/expression2/StringTable.cpp
+++ b/src/expression2/StringTable.cpp
@@ -10,6 +10,7 @@
 namespace xo {
     using xo::mm::ArenaConfig;
     using xo::mm::AAllocator;
+    using xo::mm::MemorySizeInfo;
     using xo::facet::with_facet;
     using xo::facet::obj;
 
@@ -159,6 +160,24 @@ namespace xo {
             return true;
         }
 
+        std::size_t
+        StringTable::_n_store() const noexcept
+        {
+            return 1 + map_._n_store();
+        }
+
+        MemorySizeInfo
+        StringTable::_store_info(std::size_t i) const noexcept
+        {
+            if (i == 0) 
+                return strings_._store_info();
+                
+            if (i+1 < map_._n_store())
+                return map_._store_info(i-1);
+
+            return MemorySizeInfo::sentinel();
+        }
+
     } /*namespace scm*/
 } /*namespace xo*/