diff --git a/src/emqx_crl_cache.erl b/src/emqx_crl_cache.erl
index e6132bfef..33c9d0374 100644
--- a/src/emqx_crl_cache.erl
+++ b/src/emqx_crl_cache.erl
@@ -1,6 +1,18 @@
 %%--------------------------------------------------------------------
 %% Copyright (c) 2022 EMQ Technologies Co., Ltd. All Rights Reserved.
 %%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%
 %% @doc EMQX CRL cache.
 %%--------------------------------------------------------------------
 
diff --git a/src/emqx_ocsp_cache.erl b/src/emqx_ocsp_cache.erl
index 0c03987f3..d1e11c558 100644
--- a/src/emqx_ocsp_cache.erl
+++ b/src/emqx_ocsp_cache.erl
@@ -1,6 +1,18 @@
 %%--------------------------------------------------------------------
 %% Copyright (c) 2022 EMQ Technologies Co., Ltd. All Rights Reserved.
 %%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%
 %% @doc EMQX OCSP cache.
 %%--------------------------------------------------------------------