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-rw-r--r--butl/timestamp4
1 files changed, 4 insertions, 0 deletions
diff --git a/butl/timestamp b/butl/timestamp
index e68a59f..aaef04d 100644
--- a/butl/timestamp
+++ b/butl/timestamp
@@ -61,6 +61,10 @@ namespace butl
//
// Note also that these operators/function may throw std::system_error.
//
+ // Finally, padding is not fully supported by these operators/function. They
+ // throw runtime_error if nanoseconds conversion specifier is present and
+ // the stream's width field has been set to non-zero value before the call.
+ //
// Potential improvements:
// - add flag to to_stream() to use
// - support %[<d>U] (microseconds) and %[<d>M] (milliseconds).