diff --git a/adafruit_datetime.py b/adafruit_datetime.py
index 99e30a4..83dceef 100755
--- a/adafruit_datetime.py
+++ b/adafruit_datetime.py
@@ -1520,7 +1520,14 @@ def toordinal(self) -> int:
return _ymd2ord(self._year, self._month, self._day)
def timestamp(self) -> float:
- "Return POSIX timestamp as float"
+ """Return POSIX timestamp as float.
+
+ Note that Floats on most boards are encoded in 30 bits
+ internally, with effectively 22 bits of precision. As a result,
+ for modern dates this value can be off by several minutes.
+ As a workaround you can access the function ``_mktime()``
+ to get an int version of the timestamp.
+ """
if not self._tzinfo is None:
return (self - _EPOCH).total_seconds()
s = self._mktime()
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