diff --git a/debian/mariadb-plugin-mroonga.postinst b/debian/mariadb-plugin-mroonga.postinst
index 31b53a5e3ed..fea327c204d 100644
--- a/debian/mariadb-plugin-mroonga.postinst
+++ b/debian/mariadb-plugin-mroonga.postinst
@@ -3,8 +3,6 @@
 set -e
 
 # Install Mroonga
-# No user or password parameter is required with new MariaDB that
-# has unix socket authentication support by default.
 mysql --defaults-file=/etc/mysql/debian.cnf < /usr/share/mysql/mroonga/install.sql || true
 # Always exit with success instead of leaving dpkg in a broken state
 
diff --git a/debian/mariadb-plugin-mroonga.prerm b/debian/mariadb-plugin-mroonga.prerm
index 3f707f1741f..b64ea064142 100644
--- a/debian/mariadb-plugin-mroonga.prerm
+++ b/debian/mariadb-plugin-mroonga.prerm
@@ -3,8 +3,6 @@
 set -e
 
 # Install Mroonga
-# No user or password parameter is required with new MariaDB that
-# has unix socket authentication support by default.
 mysql --defaults-file=/etc/mysql/debian.cnf < /usr/share/mysql/mroonga/uninstall.sql || true
 # Always exit with success instead of leaving dpkg in a broken state
 
diff --git a/debian/mariadb-plugin-spider.postinst b/debian/mariadb-plugin-spider.postinst
index 1d9d359c182..d4ddaa53156 100644
--- a/debian/mariadb-plugin-spider.postinst
+++ b/debian/mariadb-plugin-spider.postinst
@@ -3,8 +3,6 @@
 set -e
 
 # Install Spider
-# No user or password parameter is required with new MariaDB that
-# has unix socket authentication support by default.
 mysql --defaults-file=/etc/mysql/debian.cnf < /usr/share/mysql/install_spider.sql || true
 # Always exit with success instead of leaving dpkg in a broken state