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diff --git a/src/geometry.cpp b/src/geometry.cpp
index e5a6af2..b52ff7e 100644
--- a/src/geometry.cpp
+++ b/src/geometry.cpp
@@ -340,3 +340,15 @@ Point Geometry::GetPointForParameter(Object * obj, double t)
 	return Point(0, 0);
 }
 
+
+/*
+How to find the tangent of a point off a circle:
+
+ •  Calculate the midpoint on the point and the center of the circle
+ •  Get the length of the line segment from the and the center divided by two
+ •  Use that length to construct a circle with the point at the center and the
+    radius equal to that length
+ •  The intersection of the two circles are the tangent points
+
+*/
+