diff --git a/Dockerfile b/Dockerfile
index 9d7a679..a9bf81a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -23,7 +23,7 @@ exec /opt/mysql-proxy/bin/mysql-proxy \\\\\n\
 --plugins=proxy \\\\\n\
 --proxy-address=\${PROXY_DB_HOST}:\${PROXY_DB_PORT} \\\\\n\
 --proxy-backend-addresses=\${REMOTE_DB_HOST}:\${REMOTE_DB_PORT} \\\\\n\
---proxy-lua-script=\${PROXY_LUA_SCRIPT}\n\
+--proxy-lua-script=\${LUA_SCRIPT}\n\
 " >> /opt/entrypoint.sh && \
     chmod u+x /opt/entrypoint.sh
 EXPOSE 4040 4041
diff --git a/README.md b/README.md
index 5dbb098..84312cc 100644
--- a/README.md
+++ b/README.md
@@ -53,7 +53,7 @@ services:
       PROXY_DB_PORT: 3306
       REMOTE_DB_HOST: mysql
       REMOTE_DB_PORT: 3306
-      PROXY_LUA_SCRIPT: "/opt/mysql-proxy/conf/main.lua"
+      LUA_SCRIPT: "/opt/mysql-proxy/conf/main.lua"
     depends_on:
       - mysql
 ```
@@ -79,13 +79,14 @@ end
       PROXY_DB_PORT: 3306
       REMOTE_DB_HOST: mysql
       REMOTE_DB_PORT: 3306
-      PROXY_LUA_SCRIPT: "/opt/mysql-proxy/conf/log.lua"
+      LUA_SCRIPT: "/opt/mysql-proxy/conf/log.lua"
+      LOG_FILE: "/opt/mysql-proxy/logs/mysql.log"
 ...
 ```
 
 `/mysql-proxy/log.lua` https://gist.github.com/simonw/1039751
 ```
-local log_file = '/opt/mysql-proxy/logs/mysql.log'
+local log_file = os.getenv("LOG_FILE")
 
 local fh = io.open(log_file, "a+")
 
diff --git a/log.lua b/log.lua
index a554409..024da02 100644
--- a/log.lua
+++ b/log.lua
@@ -27,7 +27,7 @@
 -- This script will log the current date and time, the connection id
 -- and the query to a file named "mysql.log"
 --
-local log_file = '/opt/mysql-proxy/logs/mysql.log'
+local log_file = os.getenv("LOG_FILE")
 
 local fh = io.open(log_file, "a+")