diff --git a/config.template.yml b/config.template.yml
index 39ca3887d..55d5b2bb7 100644
--- a/config.template.yml
+++ b/config.template.yml
@@ -104,7 +104,7 @@ authentication_backend:
     # - OpenLDAP: (&({username_attribute}={input})(objectClass=person))' or '(&({username_attribute}={input})(objectClass=inetOrgPerson))
     #
     # To allow sign in both with username and email, one can use a filter like
-    # (&(|({username_attribute}={input})({mail_attribute={input}))(objectClass=person))
+    # (&(|({username_attribute}={input})({mail_attribute}={input}))(objectClass=person))
     users_filter: (&({username_attribute}={input})(objectClass=person))
 
     # An additional dn to define the scope of groups
diff --git a/docs/configuration/authentication/ldap.md b/docs/configuration/authentication/ldap.md
index eb6866c6e..21bcc0b7b 100644
--- a/docs/configuration/authentication/ldap.md
+++ b/docs/configuration/authentication/ldap.md
@@ -48,7 +48,7 @@ authentication_backend:
         # - OpenLDAP: (&({username_attribute}={input})(objectClass=person))' or '(&({username_attribute}={input})(objectClass=inetOrgPerson))
         #
         # To allow sign in both with username and email, one can use a filter like
-        # (&(|({username_attribute}={input})({mail_attribute={input}))(objectClass=person))
+        # (&(|({username_attribute}={input})({mail_attribute}={input}))(objectClass=person))
         users_filter: (&({username_attribute}={input})(objectClass=person))
         
         # An additional dn to define the scope of groups