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-rw-r--r--build2/operation.cxx2
1 files changed, 2 insertions, 0 deletions
diff --git a/build2/operation.cxx b/build2/operation.cxx
index 5815834..19f1ff7 100644
--- a/build2/operation.cxx
+++ b/build2/operation.cxx
@@ -173,6 +173,8 @@ namespace build2
// Re-examine postponed targets. This is the only reliable way to
// find out whether the target has changed.
//
+ // Note: must be serial.
+ //
for (target& t: psp)
{
switch (execute (a, t))