diff --git a/README.md b/README.md
index 8a17ffb..e16f4c0 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ The purpose of this repository is to store the [Package Index File][a1] for the
 
 See the following tables for all of the current FreeRTOS CMSIS packs available.
 
-[a1]: https://arm-software.github.io/CMSIS_5/Pack/html/packIndexFile.html
+[a1]: https://open-cmsis-pack.github.io/Open-CMSIS-Pack-Spec/main/html/createPackPublish.html#pidxFile
 
 ## Libraries