Index: branches/5.2.x/core/kernel/db/dbitem.php
===================================================================
--- branches/5.2.x/core/kernel/db/dbitem.php
+++ branches/5.2.x/core/kernel/db/dbitem.php
@@ -769,7 +769,7 @@
 		$affected_rows = $this->Conn->getAffectedRows();
 
 		if ( !$system_update && ($affected_rows > 0) ) {
-			$this->setModifiedFlag(ChangeLog::UPDATE);
+			$this->setModifiedFlag(ChangeLog::UPDATE, $update_fields);
 		}
 
 		$this->saveCustomFields();
@@ -1185,16 +1185,18 @@
 	/**
 	 * Set's modification flag for main prefix of current prefix to true
 	 *
-	 * @param int $mode
-	 * @access private
+	 * @param integer $mode          Mode.
+	 * @param array   $update_fields Update fields.
+	 *
+	 * @return void
 	 */
-	public function setModifiedFlag($mode = null)
+	public function setModifiedFlag($mode = null, array $update_fields = null)
 	{
 		$main_prefix = $this->Application->GetTopmostPrefix($this->Prefix);
 		$this->Application->StoreVar($main_prefix . '_modified', '1', true); // true for optional
 
-		if ($this->ShouldLogChanges(true)) {
-			$this->LogChanges($main_prefix, $mode);
+		if ( $this->ShouldLogChanges(true) ) {
+			$this->LogChanges($main_prefix, $mode, $update_fields);
 
 			if (!$this->IsTempTable()) {
 				/** @var kDBEventHandler $handler */
@@ -1222,7 +1224,7 @@
 		return $log_changes && !$this->Application->getUnitOption($this->Prefix, 'ForceDontLogChanges');
 	}
 
-	protected function LogChanges($main_prefix, $mode)
+	protected function LogChanges($main_prefix, $mode, $update_fields = null)
 	{
 		if ( !$mode ) {
 			return ;
@@ -1282,7 +1284,16 @@
 
 		switch ( $mode ) {
 			case ChangeLog::UPDATE:
-				$to_save = array_merge($this->GetTitleField(), $this->GetChangedFields());
+				$changed_fields = $this->GetChangedFields();
+
+				if ( $update_fields ) {
+					$changed_fields = array_intersect_key(
+						$changed_fields,
+						array_combine($update_fields, $update_fields)
+					);
+				}
+
+				$to_save = array_merge($this->GetTitleField(), $changed_fields);
 				break;
 
 			case ChangeLog::CREATE: