diff --git a/doc/pg_repack.rst b/doc/pg_repack.rst
index c088a59..319232f 100644
--- a/doc/pg_repack.rst
+++ b/doc/pg_repack.rst
@@ -271,6 +271,8 @@ version load the script ``$SHAREDIR/contrib/uninstall_pg_repack.sql`` into the
 database where the error occured and then load
 ``$SHAREDIR/contrib/pg_repack.sql`` again.
 
+.. class:: diag
+
 pg_repack: repack database "template1" ... skipped: pg_repack is not installed in the database
     pg_repack is not installed in the database when ``--all`` option is
     specified.
@@ -356,6 +358,8 @@ ANALYZE during pg_repack. In many
 cases pg_repack will fail and rollback correctly, but there are some cases
 which may result in data corruption.
 
+.. class:: ddl
+
 TRUNCATE
     TRUNCATE is lost. Deleted rows still exist after pg_repack.
 
diff --git a/doc/style.css b/doc/style.css
index 9049c1e..855e5fc 100644
--- a/doc/style.css
+++ b/doc/style.css
@@ -53,3 +53,10 @@ div.contents {
 div.contents ul {
 	padding-left: 1em;
 }
+
+dl.diag dt,
+dl.ddl dt {
+	font-weight: bold;
+	margin-top: 1em;
+	margin-bottom: 0.5em;
+}