pktcache: add a comment about wildcard expansions

diff --git a/lib/layer/pktcache.c b/lib/layer/pktcache.c
index cabdcfc886a9e167d85ab214b04a1663200a12d0..571e36f31442e717f9c00e5f5977a004cbb072f9 100644 (file)
--- a/lib/layer/pktcache.c
+++ b/lib/layer/pktcache.c
@@ -16,7 +16,8 @@
 
 /** @file pktcache.c
  *
- * This builtin module caches whole packets from/for negative answers.
+ * This builtin module caches whole packets from/for negative answers
+ * or answers where wildcard expansion has occured (QUERY_DNSSEC_WEXPAND).
  *
  * Note: it also persists some QUERY_DNSSEC_* flags.
  * The ranks are stored in *(uint8_t *)rrset->additional (all are the same for one packet).