diff --git a/doc/chips/icspll b/doc/chips/icspll
index 82a33289..e2c5bb54 100644
--- a/doc/chips/icspll
+++ b/doc/chips/icspll
@@ -1,3 +1,5 @@
+WARNING: THE CURRENT DRIVER SIMPLY DOES NOT WORK. DO NOT USE.
+
 ICSPLL Driver
 -------------
 This is a clock chip reader.