diff --git a/docs/pg_bulkload-ja.html b/docs/pg_bulkload-ja.html
index 25cb555..4631ed6 100644
--- a/docs/pg_bulkload-ja.html
+++ b/docs/pg_bulkload-ja.html
@@ -185,7 +185,7 @@ <h3>接続オプション</h3>
 
 <dt>-U USERNAME<br />
 --username=USERNAME</dt>
-<dd>接続するユーザ名を指定します。</dd>
+<dd>接続するユーザ名を指定します。pg_bulkloadの実行ユーザは、スーパユーザ権限が必要です。</dd>
 
 <dt>-W<br />
 --password</dt>
diff --git a/docs/pg_bulkload.html b/docs/pg_bulkload.html
index 8e62205..effc9c0 100644
--- a/docs/pg_bulkload.html
+++ b/docs/pg_bulkload.html
@@ -204,7 +204,7 @@ <h3>Connection Options</h3>
 
 <dt>-U username<br />
 --username username</dt>
-<dd>User name to connect as. </dd>
+<dd>User name to connect as. The user must be a superuser for pg_bulkload execution.</dd>
 
 <dt>-W<br />--password</dt>
 <dd>Force pg_bulkload to prompt for a password before connecting to a database.</dd>