diff --git a/README.md b/README.md
index bf68d414e6f1d4e65be98e203ed04f2ae29225ea..922057fb5d63d17fa803067a5136c28e26e6eaec 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,8 @@ Exposes a `DateTime` structure that can be initialized and acted upon using vari
 
 Currently handles dates and times based on the [Proleptic Gregorian calendar](https://en.wikipedia.org/wiki/Proleptic_Gregorian_calendar) in adherence to [ISO 8601](https://en.wikipedia.org/wiki/ISO_8601).
 
+Does not currently support time zones outside of UTC.
+
 Does not currently handle leap seconds.
 
 See the `FormatSeq` structure for display information on what to pass as a `fmt` string.