diff --git a/binary_text_edit.py b/binary_text_edit.py
index b6b2994..39d40b3 100644
--- a/binary_text_edit.py
+++ b/binary_text_edit.py
@@ -10,12 +10,19 @@ class BinaryTextEdit(QPlainTextEdit):  # rewrite QPlainTextEdit.keyPressEvent be
         if event.text() in allowed_keys:
             cursor = self.textCursor()
             pos = cursor.position()
+            text = self.toPlainText()
+            text_length = len(text)
 
             if not (pos + 1) % 9 == 0 or event.text() in {"", None}:  # dont overwrite the separator character
                 super().keyPressEvent(event)
 
             # skip over the separator character when the cursor is before it.
             if (pos + 2) % 9 == 0 and not event.text() in {"", None}:
+                if pos == text_length:  # append to the input if the cursor is at the end
+                    self.insertPlainText("  ")
+                    cursor = self.textCursor()
+                    cursor.setPosition(pos + 2)
+
                 cursor.setPosition(pos + 2)
                 self.setTextCursor(cursor)