docstring

Author: Linchin

google/cloud/bigquery/schema.py

@@ -389,9 +389,14 @@ def policy_tags(self):
 
     @property
     def timestamp_precision(self):
-        """Optional[int]: Subfields contained in this field.
+        """Optional[int]: Precision (maximum number of total digits in base 10)
+        for seconds of TIMESTAMP type.
 
-        Must be empty unset if ``field_type`` is not 'RECORD'.
+        Possible values include:
+
+        - 6 (Default, for TIMESTAMP type with microsecond precision)
+
+        - 12 (For TIMESTAMP type with picosecond precision)
         """
         return _helpers._int_or_none(self._properties.get("timestampPrecision"))