1 files changed, 1 insertions, 0 deletions
diff --git a/render.h b/render.h
index fcce37e..74bcd7f 100644
--- a/render.h
+++ b/render.h
@@ -42,6 +42,7 @@ Colour blend(Colour dst, Colour src);
 Colour blend_mod(Colour dst, Colour src, Colour mod);
 Colour col_mul(Colour a, Colour b);
 Colour col_scl(Colour a, unsigned char s);
+Colour col_add(Colour a, Colour b);
 
 typedef struct {
 	Colour* p;