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-rw-r--r--src/libstore/normalise.cc3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/libstore/normalise.cc b/src/libstore/normalise.cc
index a01b6d801704..9424bd24abd9 100644
--- a/src/libstore/normalise.cc
+++ b/src/libstore/normalise.cc
@@ -1307,6 +1307,9 @@ void SubstitutionGoal::init()
         return;
     }
 
+    /* !!! build the outgoing references of this path first to
+       maintain the closure invariant! */
+
     /* Otherwise, get the substitutes. */
     subs = querySubstitutes(storePath);