diff --git a/README.md b/README.md
index 509c4eb..67650c9 100644
--- a/README.md
+++ b/README.md
@@ -104,7 +104,7 @@ Below is the current specification of ULID as implemented in [ulid/javascript](h
 **Timestamp**
 - 48 bit integer
 - UNIX-time in milliseconds
-- Won't run out of space 'til the year 10889 AD.
+- Won't run out of space 'til the year 10889 CE.
 
 **Randomness**
 - 80 bits