diff --git a/pglab/PgLabItemDelegate.cpp b/pglab/PgLabItemDelegate.cpp
index 0806003..73ea803 100644
--- a/pglab/PgLabItemDelegate.cpp
+++ b/pglab/PgLabItemDelegate.cpp
@@ -83,7 +83,7 @@ void PgLabItemDelegate::initStyleOption(QStyleOptionViewItem *option,
 	Oid oid = InvalidOid;
 	value = index.data(Qt::UserRole); // get OID
 	if (value.isValid())
-		oid = value.toInt(); //getType(index.column());
+		oid = value.toUInt(); //getType(index.column());
 
 	value = index.data(Qt::DisplayRole);
 
@@ -112,7 +112,7 @@ void PgLabItemDelegate::initStyleOption(QStyleOptionViewItem *option,
 //	option->backgroundBrush = qvariant_cast<QBrush>(index.data(Qt::BackgroundRole));
 
 	// disable style animations for checkboxes etc. within itemviews (QTBUG-30146)
-	option->styleObject = 0;
+	option->styleObject = nullptr;
 }
 
 void PgLabItemDelegate::paint(QPainter *painter,
diff --git a/pglab/PgLabItemDelegate.h b/pglab/PgLabItemDelegate.h
index a1322cc..d11701b 100644
--- a/pglab/PgLabItemDelegate.h
+++ b/pglab/PgLabItemDelegate.h
@@ -3,6 +3,12 @@
 
 #include <QStyledItemDelegate>
 
+/** Delegate for rendering SQL data types in tableviews
+ *
+ * This delegate removes the need for the model to provide formatting information
+ * which in many cases solely based on the datatype so this delegate can determine
+ * on its own what the correct formatting is.
+ */
 class PgLabItemDelegate : public QStyledItemDelegate
 {
 public: