diff --git a/config/oidc_config.xml.sample b/config/oidc_config.xml.sample
index 7c0f15ddc62..f8618dd74dd 100644
--- a/config/oidc_config.xml.sample
+++ b/config/oidc_config.xml.sample
@@ -15,5 +15,7 @@ Note that the values of these attributes are case-sensitive.
 <OIDC>
     <Setter Property="VERIFY_SSL" Value="False" Type="bool"/>
     <Setter Property="REQUESTS_TIMEOUT" Value="3600" Type="float"/>
+    <!-- The unit of value is seconds -->
     <Setter Property="ID_TOKEN_MAX_AGE" Value="3600" Type="float"/>
+    <!-- The unit of value is seconds -->
 </OIDC>