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-rw-r--r--proto/ospf/rt.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/proto/ospf/rt.h b/proto/ospf/rt.h
index 4fc76f44..78156c75 100644
--- a/proto/ospf/rt.h
+++ b/proto/ospf/rt.h
@@ -72,7 +72,9 @@ ort;
* - nodes may be invalid (fn.type == 0), in that case other invariants don't hold
* - n.metric1 may be at most a small multiple of LSINFINITY,
* therefore sums do not overflow
- * - n.oa and n.ifa are always non-NULL
+ * - n.oa is always non-NULL
+ * - n.ifa is always non-NULL with one exception - configured stubnet
+ nodes (in po->rtf). In that case, n.nh is IFA_NONE.
* - oa->rtr does not contain calculating router itself
*/