--- a/TimeDuration.st	Thu May 10 14:57:57 2018 +0200
+++ b/TimeDuration.st	Thu May 10 14:58:05 2018 +0200
@@ -40,7 +40,14 @@
 
 documentation
 "
-    Represents a timestamp difference.
+    Represents a time/timestamp difference.
+
+    The resolution is 1 ps.
+    However, such small timedurations are usually only created by physical computations
+    (see goodies/physic).
+    The typical OS-time resolution is in the milli- or microsecond range.
+    External logging hardware may generate timestamps in the micro- or nanosecond range.
+    Picosecond resolution should be good enough for almost any application (at least for the near future).
 
     DefaultFormatForPrinting    if non-nil, allows for the variable printFormat to be overwritten
 "