//
// The sql package creates and frees connections automatically; it
// also maintains a free pool of idle connections. If the database has
-// a concept of per-connection state, such state can only be reliably
-// observed within a transaction. Once DB.Begin is called, the
+// a concept of per-connection state, such state can be reliably observed
+// within a transaction (Tx) or connection (Conn). Once DB.Begin is called, the
// returned Tx is bound to a single connection. Once Commit or
// Rollback is called on the transaction, that transaction's
// connection is returned to DB's idle connection pool. The pool size