diff --git a/README.md b/README.md
index 64c8855..c1509f5 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@ The included disks include:
 
 ## Goal
 
-Like the `NS.CLOCK.SYSTEM` (author?) ideally we would have:
+Like the `NS.CLOCK.SYSTEM` (by "CAP") ideally we would have:
 
 * A ProDOS `.SYSTEM` file
 * Which detects the presence of a Cricket
diff --git a/ns.clock.system.s b/ns.clock.system.s
index 4cd0097..ed7b979 100644
--- a/ns.clock.system.s
+++ b/ns.clock.system.s
@@ -1,3 +1,10 @@
+;;; NS.CLOCK.SYSTEM
+;;; Original by "CAP" 04/21/91
+;;; http://www.apple2.org.za/gswv/a2zine/GS.WorldView/v1999/Oct/MISC/NSC.Disk.TXT
+
+;;; Modification history available at:
+;;; https://github.com/inexorabletash/cricket
+
         .setcpu "6502"
         .linecont +