diff --git a/src/viewport_type.h b/src/viewport_type.h
--- a/src/viewport_type.h
+++ b/src/viewport_type.h
@@ -84,7 +84,8 @@ DECLARE_ENUM_AS_BIT_SET(ViewportPlaceMet
 
 /**
  * Drag and drop selection process, or, what to do with an area of land when
- * you've selected it. */
+ * you've selected it.
+ */
 enum ViewportDragDropSelectionProcess {
 	DDSP_DEMOLISH_AREA,        ///< Clear area
 	DDSP_RAISE_AND_LEVEL_AREA, ///< Raise / level area