diff --git a/notes/theory.md b/notes/theory.md
index 0012488..77346b7 100644
--- a/notes/theory.md
+++ b/notes/theory.md
@@ -22,7 +22,8 @@ Jürgen also emphasized the need for an intuitive user interface. Notes on that
 His final mathematical advice was reasonably encouraging, however:
 
 "But still I would consider it all more or less doable. One should very precisely think about a doable scope.
-I think three things are essential for the math no matter what you exactly plan.
+I think three things are essential for the math no matter what you exactly
+plan.
 
 1. Think projectively.
    Use Projective Geometry, Homogeneous Coordinates (or to a certain extent Quaternions, and Clifford Algebras, which are more or less an elegant way to merge Complex numbers with projective concepts.)