use more distinguishable +/-
diff --git a/src/cmd/diff/diffio.c b/src/cmd/diff/diffio.c
index 8037114..640f2d2 100644
--- a/src/cmd/diff/diffio.c
+++ b/src/cmd/diff/diffio.c
@@ -377,8 +377,8 @@
 		at = a;
 		for(; i<j; i++){
 			fetch(ixold, at, changes[i].a-1, input[0], "  ");
-			fetch(ixold, changes[i].a, changes[i].b, input[0], "< ");
-			fetch(ixnew, changes[i].c, changes[i].d, input[1], "> ");
+			fetch(ixold, changes[i].a, changes[i].b, input[0], "- ");
+			fetch(ixnew, changes[i].c, changes[i].d, input[1], "+ ");
 			at = changes[i].b+1;
 		}
 		fetch(ixold, at, b, input[0], "  ");