1 files changed, 1 insertions, 0 deletions
diff --git a/render.h b/render.h
index a30331f..fcce37e 100644
--- a/render.h
+++ b/render.h
@@ -41,6 +41,7 @@ Colour make_black(void);
 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);
 
 typedef struct {
 	Colour* p;