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-rw-r--r--libbuild2/rule.hxx3
1 files changed, 2 insertions, 1 deletions
diff --git a/libbuild2/rule.hxx b/libbuild2/rule.hxx
index e4afcd4..eceb6ad 100644
--- a/libbuild2/rule.hxx
+++ b/libbuild2/rule.hxx
@@ -369,7 +369,8 @@ namespace build2
// The implementation should append pattern prerequisites to
// t.prerequisite_targets[a] but not match. It should set bit 2 in
// prerequisite_target::include to indicate update=match and bit 3
- // to indicate update=unmatch.
+ // to indicate update=unmatch. It should also avoid adding duplicate
+ // fsdir{} similar to the search_prerequisite*() functions.
//
virtual void
apply_prerequisites (action, target&,