diff --git a/python/pcb.py b/python/pcb.py
index 1c0592f826f5e0e273cd449382bb095b0cbc09ff..01762a2f465d6d70f1f77c07ae575a9552db4356 100755
--- a/python/pcb.py
+++ b/python/pcb.py
@@ -4642,11 +4642,11 @@ class SAMD21E(part):
       self.value = value
       self.pad = [point(0,0,0)]
       self.labels = []
-      d = 8.5/2/25.4
-      w = 0.4/2/25.4
-      h = 1.6/2/25.4
-      p = 0.8/25.4
-      l = 0.004
+      d = 9.01/2/25.4 # spacing
+      w = 0.4/2/25.4 # width
+      h = 1.4/2/25.4 # height
+      p = 0.8/25.4 # pitch
+      l = 0.004 # text
       pad = cube(-h,h,-w,w,0,0)
       padv = cube(-w,w,-h,h,0,0)
       #