diff --git a/src/esqlite3.erl b/src/esqlite3.erl
index 3e0ef06..102c663 100644
--- a/src/esqlite3.erl
+++ b/src/esqlite3.erl
@@ -202,13 +202,13 @@ exec(Sql, {connection, _Ref, Connection}, Timeout) ->
 
 %% @doc Insert records, returns the last rowid.
 %%
-%% @spec insert(iolist(), connection()) -> integer() |  {error, error_message()}
+%% @spec insert(iolist(), connection()) -> {ok, integer()} |  {error, error_message()}
 insert(Sql, Connection) ->
     insert(Sql, Connection, ?DEFAULT_TIMEOUT).
 
 %% @doc Insert
 %%
-%% @spec insert(iolist(), connection(), timeout()) -> integer() | {error, error_message()}
+%% @spec insert(iolist(), connection(), timeout()) -> {ok, integer()} | {error, error_message()}
 insert(Sql, {connection, _Ref, Connection}, Timeout) ->
     Ref = make_ref(),
     ok = esqlite3_nif:insert(Connection, Ref, self(), Sql),
diff --git a/src/esqlite3_nif.erl b/src/esqlite3_nif.erl
index 24d8afe..147ec0b 100644
--- a/src/esqlite3_nif.erl
+++ b/src/esqlite3_nif.erl
@@ -109,7 +109,7 @@ close(_Db, _Ref, _Dest) ->
 
 %% @doc Insert record
 %%
-%% @spec insert(connection(), Ref::reference(), Dest::pid(), string()) -> ok | {error, message()}
+%% @spec insert(connection(), Ref::reference(), Dest::pid(), string()) -> {ok, integer()} | {error, message()}
 insert(_Db, _Ref, _Dest, _Sql) ->
     exit(nif_library_not_loaded).