diff --git a/includes/database.mysql.inc b/includes/database.mysql.inc
index aa87b5bffde3c051cbd2d7766acdc90d54b51a90..0e553e3f314812bc93084081cdb86aa23fbbeebc 100644
--- a/includes/database.mysql.inc
+++ b/includes/database.mysql.inc
@@ -279,11 +279,6 @@ function db_affected_rows() {
  * User-supplied arguments to the query should be passed in as separate parameters
  * so that they can be properly escaped to avoid SQL injection attacks.
  *
- * Note that if you need to know how many results were returned, you should do
- * a SELECT COUNT(*) on the temporary table afterwards. db_num_rows() and
- * db_affected_rows() do not give consistent result across different database
- * types in this case.
- *
  * @param $query
  *   A string containing an SQL query.
  * @param ...
diff --git a/includes/database.mysqli.inc b/includes/database.mysqli.inc
index e22e3ada464035e67e8a5d422ae0259e6d213791..607da05124e21e7d98af14b43d2613368665e60f 100644
--- a/includes/database.mysqli.inc
+++ b/includes/database.mysqli.inc
@@ -264,11 +264,6 @@ function db_affected_rows() {
  * User-supplied arguments to the query should be passed in as separate parameters
  * so that they can be properly escaped to avoid SQL injection attacks.
  *
- * Note that if you need to know how many results were returned, you should do
- * a SELECT COUNT(*) on the temporary table afterwards. db_num_rows() and
- * db_affected_rows() do not give consistent result across different database
- * types in this case.
- *
  * @param $query
  *   A string containing an SQL query.
  * @param ...