diff --git a/bitbutton.h b/bitbutton.h
--- a/bitbutton.h
+++ b/bitbutton.h
@@ -36,7 +36,10 @@
 	void paintEvent(QPaintEvent *event) override;
 
 private:
+	void enterEvent(QEvent * event) override;
+	void leaveEvent(QEvent * event) override;
 	bool on_;
+	bool over_;
 };
 
 #endif
diff --git a/bitbutton.cpp b/bitbutton.cpp
--- a/bitbutton.cpp
+++ b/bitbutton.cpp
@@ -28,7 +28,7 @@
 // Name: BitButton
 // Desc: constructor
 //------------------------------------------------------------------------------
-BitButton::BitButton(QWidget *parent) : QAbstractButton(parent), on_(false) {
+BitButton::BitButton(QWidget *parent) : QAbstractButton(parent), on_(false) , over_(false) {
 
 	// too many bits for tab focus
 	setFocusPolicy(Qt::ClickFocus);
@@ -43,6 +43,8 @@
 	}
 	
 	setFixedSize(size.expandedTo(QApplication::globalStrut()));
+
+	this->setAttribute(Qt::WA_Hover, true);
 }
 
 //------------------------------------------------------------------------------
@@ -63,3 +65,27 @@
 	on_ = value;
 	update();
 }
+
+//------------------------------------------------------------------------------
+// Name: enterEvent
+// Desc: sets to true the "over" variable on Enter event
+//------------------------------------------------------------------------------
+void BitButton::enterEvent(QEvent * event) {
+
+	if (event->type() == QEvent::Enter) {
+		over_ = true;
+		update();
+	}
+}
+
+//------------------------------------------------------------------------------
+// Name: leaveEvent
+// Desc: sets to false the "over" variable on Leave event
+//------------------------------------------------------------------------------
+void BitButton::leaveEvent(QEvent * event) {
+
+	if (event->type() == QEvent::Leave) {
+		over_ = false;
+		update();
+	}
+}
diff --git a/kcalc_bitset.cpp b/kcalc_bitset.cpp
--- a/kcalc_bitset.cpp
+++ b/kcalc_bitset.cpp
@@ -41,12 +41,17 @@
 void BitButton::paintEvent(QPaintEvent *) {
 
 	QPainter painter(this);
-	QPen pen(palette().text(), 2);
+	QPen pen(palette().text(), 1);
 	pen.setJoinStyle(Qt::MiterJoin);
 	painter.setPen(pen);
 
 	if (on_) {
 		painter.setBrush(palette().text());
+	} else if (over_) {
+		painter.setBrush(QColor(palette().text().color().red(),
+					palette().text().color().green(),
+					palette().text().color().blue(),
+					128));
 	} else {
 		painter.setBrush(palette().base());
 	}
@@ -87,6 +92,7 @@
 
 			for (int bit = 0; bit < 8; bit++) {
 				BitButton *const tmpBitButton = new BitButton(this);
+				tmpBitButton->setToolTip(tr("Bit ") + QString::number(bitCounter));
 				wordlayout->addWidget(tmpBitButton);
 				bit_button_group_->addButton(tmpBitButton, bitCounter);
 				bitCounter--;