diff --git a/No_Slot_Clock/README.md b/No_Slot_Clock/README.md
index aea99a7..f8a746a 100644
--- a/No_Slot_Clock/README.md
+++ b/No_Slot_Clock/README.md
@@ -1,7 +1,10 @@
-# `NS.CLOCK.SYSTEM`
+# `NS.CLKUW.SYSTEM`
 
 ## No Slot Clock Driver for ProDOS
 
+`NS.CLKUW.SYSTEM` is a version of the original No Slot Clock Driver
+`NS.CLOCK.SYSTEM`, modified to work with the RM Ultrawarp accelerator.
+
 `nsc.s` is the original No Slot Clock driver written by SMT, which has been
 disassembled and commented by Github user mgcaret.  I took it from
 [here](https://gist.github.com/mgcaret/ae2860c754fd029d2640107c4fe0bffd).