diff --git a/MiSTer.ini b/MiSTer.ini
index c9a87c5..56164db 100644
--- a/MiSTer.ini
+++ b/MiSTer.ini
@@ -72,8 +72,8 @@ dvi_mode=0
 ;12 - 1920x1440@60
 ;13 - 2048x1536@60
 ;
-; custom mode: hact,hfp,hs,hbp,vact,vfp,vs,vbp,Fpix_in_KHz
-;   video_mode=1280,110,40,220,720,5,5,20,74250
+; custom mode: hact,hfp,hs,hbp,vact,vfp,vs,vbp,Fpix_in_KHz[,hsyncp,vsyncp]
+;   video_mode=1280,110,40,220,720,5,5,20,74250,0,0
 video_mode=0
 
 ; set to 1-10 (seconds) to display video info on startup/change
diff --git a/video.cpp b/video.cpp
index d8540c9..49e3c6d 100644
--- a/video.cpp
+++ b/video.cpp
@@ -912,10 +912,16 @@ static void set_video(vmode_custom_t *v, double Fpix)
 	printf("video: ");
 	for (int i = 1; i <= 8; i++)
 	{
-		spi_w(v_fix.item[i]);
+		//hsync polarity
+		if (i == 3) spi_w((!!v_cur.item[21] << 15) | v_fix.item[i]);
+		//vsync polarity
+		else if (i == 7) spi_w((!!v_cur.item[22] << 15) | v_fix.item[i]);
+		else spi_w(v_fix.item[i]);
 		printf("%d(%d), ", v_cur.item[i], v_fix.item[i]);
 	}
 
+	printf("%chsync, %cvsync", !!v_cur.item[21]?'+':'-', !!v_cur.item[22]?'+':'-');
+
 	if(Fpix) setPLL(Fpix, &v_cur);
 
 	printf("\nPLL: ");
@@ -970,7 +976,11 @@ static int parse_custom_video_mode(char* vcfg, vmode_custom_t *v)
 			}
 
 			setPLL(Fpix, v);
-			break;
+			//read sync polarities if present
+			if (*next == ',') next++;
+			vcfg = next;
+			cnt = 21;
+			continue;
 		}
 
 		uint32_t val = strtoul(vcfg, &next, 0);