diff --git a/sources/diagramview.cpp b/sources/diagramview.cpp
index ffe249110..73dcb018a 100644
--- a/sources/diagramview.cpp
+++ b/sources/diagramview.cpp
@@ -1153,7 +1153,7 @@ void DiagramView::editSelection()
 	QGraphicsItem *item = m_diagram->selectedItems().first();
 
 		//We use dynamic_cast instead of qgraphicsitem_cast for QetGraphicsItem
-		//because they haven't got they own type().
+		//because they haven't got their own type().
 		//Use qgraphicsitem_cast will have weird behavior for this class.
 	if (IndependentTextItem *iti = qgraphicsitem_cast<IndependentTextItem *>(item))
 		iti -> edit();
diff --git a/sources/qet.cpp b/sources/qet.cpp
index 3537e24ba..8852dc218 100644
--- a/sources/qet.cpp
+++ b/sources/qet.cpp
@@ -32,6 +32,10 @@
 	en orientation. Si la chaine fait plusieurs caracteres, seul le
 	premier est pris en compte. En cas d'incoherence, Qet::North est
 	retourne.
+	Used to convert a string of characters (‘n’, ‘s’, ‘e’ or ‘w’)
+	into orientation. If the string is made up of several characters,
+	only the only the first is taken into account. In the event of an
+	inconsistency, Qet::North is returned.
 	@param s Chaine de caractere cense representer une orientation
 	@return l'orientation designee par la chaine de caractere
 */
@@ -60,6 +64,7 @@ QString Qet::orientationToString(Qet::Orientation o) {
 
 /**
 	Indique si deux orientations de Borne sont sur le meme axe (Vertical / Horizontal).
+	Indicates whether two terminal orientations are on the same axis (Vertical / Horizontal).
 	@param a La premiere orientation de Borne
 	@param b La seconde orientation de Borne
 	@return Un booleen a true si les deux orientations de bornes sont sur le meme axe
diff --git a/sources/qetdiagrameditor.cpp b/sources/qetdiagrameditor.cpp
index e50b158e4..b0da9e157 100644
--- a/sources/qetdiagrameditor.cpp
+++ b/sources/qetdiagrameditor.cpp
@@ -1597,7 +1597,7 @@ void QETDiagramEditor::slot_updateUndoStack()
 
 /**
 	@brief QETDiagramEditor::slot_updateComplexActions
-	Manage the actions who need some conditions to be enable or not.
+	Manage the actions that need some conditions to be enabled or not.
 	This method does nothing if there is no project opened
 */
 void QETDiagramEditor::slot_updateComplexActions()
@@ -1633,7 +1633,7 @@ void QETDiagramEditor::slot_updateComplexActions()
 	int selected_elements_count = dc.count(DiagramContent::Elements);
 	m_find_element->setEnabled(selected_elements_count == 1);
 
-	//Action that need items (elements, conductors, texts...) selected, to be enabled
+	//Actions that need items (elements, conductors, texts...) selected, to be enabled
 	bool copiable_items  = dc.hasCopiableItems();
 	bool deletable_items = dc.hasDeletableItems();
 	m_cut              -> setEnabled(!ro && copiable_items);
diff --git a/sources/qetgraphicsitem/conductor.cpp b/sources/qetgraphicsitem/conductor.cpp
index 2a50b82f0..ecca2c370 100644
--- a/sources/qetgraphicsitem/conductor.cpp
+++ b/sources/qetgraphicsitem/conductor.cpp
@@ -384,9 +384,11 @@ void Conductor::generateConductorPath(const QPointF &p1, Qet::Orientation o1, co
 	points << depart0;
 
 	// prolongement de la borne de depart
+	// extend start terminal
 	points << depart;
 
 	// commence le vrai trajet
+	// starts the real path
 	if (depart.y() < arrivee.y()) {
 		// trajet descendant
 		if ((ori_depart == Qet::North && (ori_arrivee == Qet::South || ori_arrivee == Qet::West)) || (ori_depart == Qet::East && ori_arrivee == Qet::West)) {
diff --git a/sources/qetgraphicsitem/terminal.cpp b/sources/qetgraphicsitem/terminal.cpp
index 0a3cd2107..09558ee8b 100644
--- a/sources/qetgraphicsitem/terminal.cpp
+++ b/sources/qetgraphicsitem/terminal.cpp
@@ -37,6 +37,7 @@ const qreal Terminal::Z = 1000;
 /**
 	@brief Terminal::init
 	Methode privee pour initialiser la borne.
+	Private method to initialize the terminal.
 	@param number of terminal
 	@param name of terminal
 	@param hiddenName
@@ -92,17 +93,25 @@ Terminal::~Terminal() {
 	est bien un Element, cette fonction renvoie l'orientation par rapport a
 	la scene de la borne, en tenant compte du fait que l'element ait pu etre
 	pivote. Sinon elle renvoie son sens normal.
+	Used to find out the orientation of the terminal. If the terminal's parent
+	is in fact an Element, this function returns the orientation of the
+	terminal with respect to the scene, taking into account the angle of
+	rotation. scene, taking into account the fact that the element may have
+	been rotated. Otherwise it returns its normal direction.
 	@return L'orientation actuelle de la Terminal.
 */
 Qet::Orientation Terminal::orientation() const
 {
 	if (Element *elt = qgraphicsitem_cast<Element *>(parentItem())) {
 		// orientations actuelle et par defaut de l'element
+		// current and default element orientations
 		int ori_cur = elt -> orientation();
 	if (ori_cur == 0) return(d->m_orientation);
 		else {
 			// calcul l'angle de rotation implique par l'orientation de l'element parent
 			// angle de rotation de la borne sur la scene, divise par 90
+			// calculates the angle of rotation implied by the orientation of the parent
+			// element angle of rotation of the terminal on the scene, divided by 90
 			int angle = ori_cur + d->m_orientation;
 			while (angle >= 4) angle -= 4;
 			return((Qet::Orientation)angle);