diff --git a/docs/exporters.md b/docs/exporters.md
index eddbbdcaa3..a4c29712b7 100644
--- a/docs/exporters.md
+++ b/docs/exporters.md
@@ -53,7 +53,12 @@ The dname (device name) field on line 156 directly corresponds to that in the Uv
 ##### IAR
 [`tools/export/iar/iar_definitions.json`](https://github.com/ARMmbed/mbed-os/blob/master/tools/export/iar/iar_definitions.json) utilizes this device name to store information necessary to set the target in an IAR project.
 
-
+##### Updating index.json
+You can regenerate `index.json` to contain a newly made CMSIS pack with the following command:
+
+`mbed export -i [IDE] --update-packs`
+
+You should include the changes to `index.json` in your PR that adds support for the new target.