diff --git a/Fonderie/crapulator.c b/Fonderie/crapulator.c
index c02658b..4a5af6b 100644
--- a/Fonderie/crapulator.c
+++ b/Fonderie/crapulator.c
@@ -510,6 +510,11 @@ switch (idFx) {
 		retval = run_triptyq(image, 0);
 		break;
 
+	case CR_togray:
+		retval = fimg_to_gray(image);
+		break;
+
+
 	default :
 		fprintf(stderr, "%s : effect #%d invalid\n", 
 				__func__, idFx);
diff --git a/Fonderie/crapulors.liste b/Fonderie/crapulors.liste
index 7e0196f..1674565 100644
--- a/Fonderie/crapulors.liste
+++ b/Fonderie/crapulors.liste
@@ -46,4 +46,6 @@
 62	suprbg		1	0
 80	thermocol	1	0
 81	triptyq		1	0
+90	togray		1	0
 -1	end		1	1.0
+