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-rw-r--r--butl/timestamp3
1 files changed, 3 insertions, 0 deletions
diff --git a/butl/timestamp b/butl/timestamp
index f397dc6..77af4f1 100644
--- a/butl/timestamp
+++ b/butl/timestamp
@@ -30,6 +30,9 @@ namespace butl
//
using std::chrono::system_clock;
+ // Note that uninitialized timestamp has the timestamp_nonexistent
+ // value.
+ //
using timestamp = system_clock::time_point;
using duration = system_clock::duration;