diff --git a/db/config.cc b/db/config.cc
index ee894ce1a6..d8e6ae70df 100644
--- a/db/config.cc
+++ b/db/config.cc
@@ -1478,6 +1478,8 @@ db::config::config(std::shared_ptr<db::extensions> exts)
     , alternator_max_expression_cache_entries_per_shard(this, "alternator_max_expression_cache_entries_per_shard", liveness::LiveUpdate, value_status::Used, 2000, "Maximum number of cached parsed request expressions, per shard.")
     , alternator_max_users_query_size_in_trace_output(this, "alternator_max_users_query_size_in_trace_output", liveness::LiveUpdate, value_status::Used, uint64_t(4096),
             "Maximum size of user's command in trace output (`alternator_op` entry). Larger traces will be truncated and have `<truncated>` message appended - which doesn't count to the maximum limit.")
+    , alternator_describe_table_info_cache_validity_in_seconds(this, "alternator_describe_table_info_cache_validity_in_seconds", liveness::LiveUpdate, value_status::Used, 60 * 60 * 6,
+        "The validity of DescribeTable information - table size in bytes. This is how long calculated value will be reused before recalculation.")
     , abort_on_ebadf(this, "abort_on_ebadf", value_status::Used, true, "Abort the server on incorrect file descriptor access. Throws exception when disabled.")
     , sanitizer_report_backtrace(this, "sanitizer_report_backtrace", value_status::Used, false,
             "In debug mode, report log-structured allocator sanitizer violations with a backtrace. Slow.")
diff --git a/db/config.hh b/db/config.hh
index 4076d209dd..f4626e2598 100644
--- a/db/config.hh
+++ b/db/config.hh
@@ -477,6 +477,7 @@ public:
     named_value<bool> alternator_allow_system_table_write;
     named_value<uint32_t> alternator_max_expression_cache_entries_per_shard;
     named_value<uint64_t> alternator_max_users_query_size_in_trace_output;
+    named_value<uint32_t> alternator_describe_table_info_cache_validity_in_seconds;
 
     named_value<bool> abort_on_ebadf;