diff --git a/lib/erl/src/thrift_client.erl b/lib/erl/src/thrift_client.erl
index 1c27405..f5f4415 100644
--- a/lib/erl/src/thrift_client.erl
+++ b/lib/erl/src/thrift_client.erl
@@ -31,6 +31,7 @@
     seqid :: non_neg_integer()
 }).
 -type tclient() :: #tclient{}.
+-export_type([tclient/0]).
 
 new(Protocol, Service) when
     is_atom(Service)
diff --git a/lib/erl/src/thrift_reconnecting_client.erl b/lib/erl/src/thrift_reconnecting_client.erl
index c9fe2aa..6e99bb8 100644
--- a/lib/erl/src/thrift_reconnecting_client.erl
+++ b/lib/erl/src/thrift_reconnecting_client.erl
@@ -41,16 +41,16 @@
 ]).
 
 -record(state, {
-    client = nil,
-    host,
-    port,
-    thrift_svc,
-    thrift_opts,
-    reconn_min,
-    reconn_max,
-    reconn_time = 0,
-    op_cnt_dict,
-    op_time_dict
+    client = nil :: 'nil' | thrift_client:tclient(),
+    host :: inet:socket_address() | inet:hostname(),
+    port :: inet:port_number(),
+    thrift_svc :: atom(),
+    thrift_opts :: list(),
+    reconn_min :: integer(),
+    reconn_max :: integer(),
+    reconn_time = 0 :: integer(),
+    op_cnt_dict :: dict:dict(),
+    op_time_dict :: dict:dict()
 }).
 
 %%====================================================================