diagram: fix a typo in a comment s/con/cos/

diff --git a/src/diagram/diagram.py b/src/diagram/diagram.py
index ec45e5c..e6c51c4 100755 (executable)
--- a/src/diagram/diagram.py
+++ b/src/diagram/diagram.py
@@ -162,7 +162,7 @@ class Diagram(object):
         #      | 0  0       1 |
         #
         #      | cos(theta)  -sin(theta)  0 |
-        # R  = | sin(theta)   con(theta)  0 |
+        # R  = | sin(theta)   cos(theta)  0 |
         #      |          0            0  1 |
         #
         #      | 1  0  dest_x |