diff --git a/xml/queries.xml b/xml/queries.xml
index 3a186642e..917a865d2 100644
--- a/xml/queries.xml
+++ b/xml/queries.xml
@@ -15,12 +15,6 @@
         <order query="ORDER BY %s ASC"/>
         <count query="COUNT(%s)"/>
         <comment query="-- " query2="/*" query3="#"/>
-        <!--
-             NOTE: MySQL 5.0.12 introduced SLEEP() function
-                   References:
-                   * http://dev.mysql.com/doc/refman/5.0/en/news-5-0-12.html
-                   * http://dev.mysql.com/doc/refman/5.1/en/miscellaneous-functions.html#function_sleep
-        -->
         <substring query="MID((%s),%d,%d)"/>
         <concatenate query="CONCAT(%s,%s)"/>
         <case query="SELECT (CASE WHEN (%s) THEN 1 ELSE 0 END)"/>
@@ -89,12 +83,6 @@
         <order query="ORDER BY %s ASC"/>
         <count query="COUNT(%s)"/>
         <comment query="--" query2="/*"/>
-        <!--
-             NOTE: PostgreSQL 8.2 introduced PG_SLEEP() function
-                   References:
-                   * http://www.postgresql.org/docs/8.3/interactive/release-8-2.html
-                   * http://www.postgresql.org/docs/8.3/interactive/functions-datetime.html#FUNCTIONS-DATETIME-DELAY
-        -->
         <substring query="SUBSTR((%s)::text,%d,%d)"/>
         <concatenate query="%s||%s"/>
         <case query="SELECT (CASE WHEN (%s) THEN '1' ELSE '0' END)"/>