diff --git a/Doc/library/sqlite3.rst b/Doc/library/sqlite3.rst
index 9b913af..c32bb90 100644
--- a/Doc/library/sqlite3.rst
+++ b/Doc/library/sqlite3.rst
@@ -832,6 +832,10 @@
 
 .. literalinclude:: ../includes/sqlite3/pysqlite_datetime.py
 
+If a timestamp stored in SQLite has a fractional part longer than 6
+numbers, its value will be truncated to microsecond precision by the
+timestamp converter.
+
 
 .. _sqlite3-controlling-transactions: