diff --git a/apps/expression_editor/controller.cpp b/apps/expression_editor/controller.cpp
index 1ed4f7d7e..40563a736 100644
--- a/apps/expression_editor/controller.cpp
+++ b/apps/expression_editor/controller.cpp
@@ -80,8 +80,7 @@ ExpressionLayout * Controller::handleAddEvent(Ion::Events::Event event) {
     return m_cursor.addEmptyFractionLayout();
   }
   if (event == Ion::Events::XNT) {
-    //TODO
-    return nullptr;
+    return m_cursor.addXNTCharLayout();
   }
   if (event == Ion::Events::Exp) {
     return m_cursor.addEmptyExponentialLayout();
diff --git a/poincare/include/poincare/expression_layout.h b/poincare/include/poincare/expression_layout.h
index 5398dee72..021f891da 100644
--- a/poincare/include/poincare/expression_layout.h
+++ b/poincare/include/poincare/expression_layout.h
@@ -63,13 +63,17 @@ public:
   bool moveUpInside(ExpressionLayoutCursor * cursor);
   virtual bool moveDown(ExpressionLayoutCursor * cursor, ExpressionLayout * previousLayout = nullptr, ExpressionLayout * previousPreviousLayout = nullptr);
   bool moveDownInside(ExpressionLayoutCursor * cursor);
+
+  /* Other */
+  virtual char XNTChar() const;
+
 protected:
   virtual void render(KDContext * ctx, KDPoint p, KDColor expressionColor, KDColor backgroundColor) = 0;
   virtual KDSize computeSize() = 0;
   virtual void computeBaseline() = 0;
   virtual KDPoint positionOfChild(ExpressionLayout * child) = 0;
   void detachChildAtIndex(int i);
-    virtual void moveCursorInsideAtDirection (
+  virtual void moveCursorInsideAtDirection (
     VerticalDirection direction,
     ExpressionLayoutCursor * cursor,
     ExpressionLayout ** childResult,
diff --git a/poincare/include/poincare/expression_layout_cursor.h b/poincare/include/poincare/expression_layout_cursor.h
index d7bb195ff..5b9dfae37 100644
--- a/poincare/include/poincare/expression_layout_cursor.h
+++ b/poincare/include/poincare/expression_layout_cursor.h
@@ -49,6 +49,7 @@ public:
   ExpressionLayout * addEmptyPowerLayout();
   ExpressionLayout * addEmptyRootLayout();
   ExpressionLayout * addEmptySquarePowerLayout();
+  ExpressionLayout * addXNTCharLayout();
   ExpressionLayout * insertText(const char * text);
 
 private:
diff --git a/poincare/src/expression_layout_cursor.cpp b/poincare/src/expression_layout_cursor.cpp
index 8db913a3f..19016af2c 100644
--- a/poincare/src/expression_layout_cursor.cpp
+++ b/poincare/src/expression_layout_cursor.cpp
@@ -102,6 +102,12 @@ ExpressionLayout * ExpressionLayoutCursor::addEmptySquarePowerLayout() {
   return child1;
 }
 
+ExpressionLayout * ExpressionLayoutCursor::addXNTCharLayout() {
+  CharLayout * newChild = new CharLayout(m_pointedExpressionLayout->XNTChar());
+  m_pointedExpressionLayout->addBrother(this, newChild);
+  return newChild;
+}
+
 ExpressionLayout * ExpressionLayoutCursor::insertText(const char * text) {
   int textLength = strlen(text);
   if (textLength <= 0) {
diff --git a/poincare/src/layout/expression_layout.cpp b/poincare/src/layout/expression_layout.cpp
index 3a92820d7..cb2bdb2a0 100644
--- a/poincare/src/layout/expression_layout.cpp
+++ b/poincare/src/layout/expression_layout.cpp
@@ -189,6 +189,13 @@ void ExpressionLayout::detachChild(const ExpressionLayout * e) {
   }
 }
 
+char ExpressionLayout::XNTChar() const {
+  if (m_parent == nullptr) {
+    return 'x';
+  }
+  return m_parent->XNTChar();
+}
+
 void ExpressionLayout::detachChildAtIndex(int i) {
   ExpressionLayout ** op = const_cast<ExpressionLayout **>(children());
   if (op[i] != nullptr && op[i]->parent() == this) {
diff --git a/poincare/src/layout/sequence_layout.cpp b/poincare/src/layout/sequence_layout.cpp
index 3955f77b3..691a9a29c 100644
--- a/poincare/src/layout/sequence_layout.cpp
+++ b/poincare/src/layout/sequence_layout.cpp
@@ -128,6 +128,10 @@ bool SequenceLayout::moveDown(ExpressionLayoutCursor * cursor, ExpressionLayout
   return ExpressionLayout::moveDown(cursor, previousLayout, previousPreviousLayout);
 }
 
+char SequenceLayout::XNTChar() const {
+  return 'n';
+}
+
 ExpressionLayout * SequenceLayout::upperBoundLayout() {
   return editableChild(0);
 }
diff --git a/poincare/src/layout/sequence_layout.h b/poincare/src/layout/sequence_layout.h
index 6e186982d..98e100420 100644
--- a/poincare/src/layout/sequence_layout.h
+++ b/poincare/src/layout/sequence_layout.h
@@ -14,6 +14,7 @@ public:
   bool moveRight(ExpressionLayoutCursor * cursor) override;
   bool moveUp(ExpressionLayoutCursor * cursor, ExpressionLayout * previousLayout, ExpressionLayout * previousPreviousLayout) override;
   bool moveDown(ExpressionLayoutCursor * cursor, ExpressionLayout * previousLayout, ExpressionLayout * previousPreviousLayout) override;
+  char XNTChar() const override;
 protected:
   constexpr static KDCoordinate k_boundHeightMargin = 2;
   ExpressionLayout * lowerBoundLayout();