1 files changed, 3 insertions, 0 deletions
diff --git a/geometry.go b/geometry.go
index c9453a9..3c3ba83 100644
--- a/geometry.go
+++ b/geometry.go
@@ -2,18 +2,21 @@
 
 package main
 
+// representation of a three-dimensional point in space
 type Point struct {
 	x float32
 	y float32
 	z float32
 }
 
+// a triangle consists of three points
 type Triangle struct {
 	a *Point
 	b *Point
 	c *Point
 }
 
+// a surface is made of a slice of triangles
 type Surface struct {
 	triangles []*Triangle
 }