diff --git a/USER_GUIDE.md b/USER_GUIDE.md
index 7a83038..f9d55ae 100644
--- a/USER_GUIDE.md
+++ b/USER_GUIDE.md
@@ -41,6 +41,7 @@ Option | Default Value | Valid Options |  Environment Variable | Description
 --subject | This is an email containing your dashboard report | - | OPENSEARCH_SUBJECT | subject for the email
 --note | Hi,\nHere is the latest report! | string or path to text file | OPENSEARCH_EMAIL_NOTE | The email body
 --selfsignedcerts | false | true, false | - | enable or disable self-signed certicates for smtp transport
+--timeout | 300000ms | - | OPENSEARCH_TIMEOUT | timeout for generating report in ms
 | - | - | - | CHROMIUM_PATH | path to chromium directory
 
 You can also find this information using help command.
diff --git a/src/arguments.js b/src/arguments.js
index 0099183..516588f 100644
--- a/src/arguments.js
+++ b/src/arguments.js
@@ -68,7 +68,7 @@ async function getCommandArguments() {
         .addOption(new Option('--selfsignedcerts <flag>', 'enable or disable self-signed certicates for smtp transport')
             .default(DEFAULT_SELF_SIGNED_CERTIFICATES)
             .choices(['true', 'false']))
-        .addOption(new Option('--timeout <timeout>', 'timeout for generating report')
+        .addOption(new Option('--timeout <timeout>', 'timeout for generating report in ms')
             .default(DEFAULT_TIMEOUT)
             .env(ENV_VAR.TIMEOUT));
 
diff --git a/test/help.test.js b/test/help.test.js
index c9acc8a..ad01ada 100644
--- a/test/help.test.js
+++ b/test/help.test.js
@@ -34,7 +34,7 @@ Options:
   --subject <subject>                    email subject (default: "This is an email containing your opensearch dashboard report", env: OPENSEARCH_EMAIL_SUBJECT)
   --note <note>                          email body (string or path to text file) (default: "Hi,\\nHere is the latest report!", env: OPENSEARCH_EMAIL_NOTE)
   --selfsignedcerts <flag>               enable or disable self-signed certicates for smtp transport (choices: "true", "false", default: false)
-  --timeout <timeout>                    timeout for generating report (default: 300000, env: OPENSEARCH_TIMEOUT)
+  --timeout <timeout>                    timeout for generating report in ms (default: 300000, env: OPENSEARCH_TIMEOUT)
   -h, --help                             display help for command
 
 Note: The tenant in the url has the higher priority than tenant value provided as command option.