diff --git a/time.c b/time.c
index 48eb4d7b04..825175f245 100644
--- a/time.c
+++ b/time.c
@@ -4020,13 +4020,16 @@ time_eql(VALUE time1, VALUE time2)
  *    # => 2000-01-01 20:15:01 UTC
  *    utc.utc? # => true
  *
- *  Note that only +Time+ objects created with these methods
- *  considered in UTC:
+ * +Time+ objects created with these methods are considered to be in
+ * UTC:
  *
  *  * Time.utc
  *  * Time#utc
  *  * Time#getutc
  *
+ * Objects created in other ways will not be treated as UTC even if
+ * the environment variable "TZ" is "UTC".
+ *
  *  Related: Time.utc.
  */