diff --git a/boxes/__init__.py b/boxes/__init__.py
index 69f4a8d..60104c9 100755
--- a/boxes/__init__.py
+++ b/boxes/__init__.py
@@ -937,7 +937,7 @@ class Boxes:
 
         """
         c4 = (r+self.burn)*math.pi*0.5 # circumference of quarter circle
-        c4 = 0.9 * c4 # stretch flex 10%
+        c4 = c4 / self.edges["X"].settings.stretch
 
         top = self.edges.get(top, top)
         bottom = self.edges.get(bottom, bottom)
diff --git a/boxes/edges.py b/boxes/edges.py
index b3e8db2..6e4cbd5 100644
--- a/boxes/edges.py
+++ b/boxes/edges.py
@@ -461,7 +461,7 @@ class FlexSettings(Settings):
         "width" : 5.0,
         }
     absolute_params = {
-        "stretch" : 1.0,
+        "stretch" : 1.05,
         }
 
 class FlexEdge(Edge):
diff --git a/documentation/TODO.txt b/documentation/TODO.txt
index 8d1bb25..97b2abf 100644
--- a/documentation/TODO.txt
+++ b/documentation/TODO.txt
@@ -5,3 +5,4 @@
  * Make settings nicer
   * Offer a collection of different settings
  * Make bolts configurable (e.g. box2.py)
+ * Use stretch seting in flexboxes