diff --git a/Set_movable_separability_2/doc/Set_movable_separability_2/Set_movable_separability_2.txt b/Set_movable_separability_2/doc/Set_movable_separability_2/Set_movable_separability_2.txt
old mode 100644
new mode 100755
index 32e3051acd5..c21ee4bd0f0
--- a/Set_movable_separability_2/doc/Set_movable_separability_2/Set_movable_separability_2.txt
+++ b/Set_movable_separability_2/doc/Set_movable_separability_2/Set_movable_separability_2.txt
@@ -73,9 +73,9 @@ right.
 The input polygon must satisfy two conditions as follows. First, it
 has to be simple. Essentially, a simple polygon is topologically
 equivalent to a disk; see Chapter \ref
-Chapter_2D_Regularized_Boolean_Set-Operations "2D Regularized Boolean
-Set-Operations" for the precise definition of simple
-polygons. Secondly, any consecutive three vertices cannot be
+Chapter_2D_Regularized_Boolean_Set-Operations
+"2D Regularized Boolean Set-Operations" for the precise definition
+of simple polygons. Secondly, any consecutive three vertices cannot be
 collinear. If you suspect that the input polygon may not satisfy the
 latter condition, pre-process the polygon to eliminate this
 ill-condition.