diff --git a/.travis.yml b/.travis.yml
index c3955b1..a92cf9a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -38,6 +38,7 @@ install:
   - sudo cpanm --notest Test::Nginx > build.log 2>&1 || (cat build.log && exit 1)
   - wget http://nginx.org/download/nginx-${NGINX_VERSION}.tar.gz
   - git clone https://github.com/openresty/openresty.git ../openresty
+  - git clone https://github.com/openresty/lua-resty-core.git ../lua-resty-core
   - git clone https://github.com/openresty/nginx-devel-utils.git
   - git clone https://github.com/simpl/ngx_devel_kit.git ../ndk-nginx-module
   - git clone https://github.com/openresty/lua-nginx-module.git ../lua-nginx-module
diff --git a/README.markdown b/README.markdown
index 2b06718..75395bf 100644
--- a/README.markdown
+++ b/README.markdown
@@ -43,7 +43,7 @@ Synopsis
 http {
     # you do not need the following line if you are using the
     # OpenResty bundle:
-    lua_package_path "/path/to/lua-resty-lock/lib/?.lua;;";
+    lua_package_path "/path/to/lua-resty-core/lib/?.lua;/path/to/lua-resty-lock/lib/?.lua;;";
 
     lua_shared_dict my_locks 100k;
 
@@ -152,6 +152,8 @@ Common errors for this method call is
 
 Other possible errors are from ngx_lua's shared dictionary API.
 
+It is required to create different `resty.lock` instances for multiple simultaneous locks (i.e., those around different keys).
+
 [Back to TOC](#table-of-contents)
 
 unlock