diff --git a/dblayeroo.php b/dblayeroo.php
index 9447287..d0349d2 100644
--- a/dblayeroo.php
+++ b/dblayeroo.php
@@ -2767,6 +2767,8 @@ class dblayeroo
     $sql = $this->createRequest ();
     if ($this->driver === "pgsql" && $this->command === "INSERT")
     {
+       // PgSQL doesn't support the lastInsertId if there is no autoincrement
+       // field. Will return the primary key
        $sql .= " RETURNING ".$this->sep.$this->primary.$this->sep;
     }
     $this->debugLog ("Entering prepareRequest (XXX, ",false,")");