diff --git a/src/scan.re.c b/src/scan.re.c
index e071e1f..ca86804 100644
--- a/src/scan.re.c
+++ b/src/scan.re.c
@@ -446,8 +446,8 @@ void scan_glider_graph(struct scan *const scan) {
 		date32_to_string(line.date, &datestr);
 		const struct source *src = source_lookup(scan, line);
 		assert(src);
-		if(!src->name.a) { fprintf(stderr, "Glider has no source at %s.\n",
-			datestr); continue; }
+		if(!src->name.a) { fprintf(stderr,
+			"Glider has no source at %s; ignoring.\n", datestr); continue; }
 		printf("%s, ", datestr);
 		printf("%.*s, %" PRIu32 ", %" PRIu32,
 			(int)(glider->reg.b - glider->reg.a), glider->reg.a,