1 files changed, 1 insertions, 1 deletions
diff --git a/geometry.h b/geometry.h
index a62d667..0e4f748 100644
--- a/geometry.h
+++ b/geometry.h
@@ -1,4 +1,4 @@
-#define DEG 0.01745329251994330
+#define DEG 0.01745329251994330	/* π/180 */
 
 typedef struct Point2 Point2;
 typedef struct Point3 Point3;