diff --git a/Documentation/bluetooth/card10.rst b/Documentation/bluetooth/card10.rst
index 9099281bd5d110208fa674cd971bc2f019bdb1b2..2991fa2ff019e8c224211c2232ad84c75d3c0dc0 100644
--- a/Documentation/bluetooth/card10.rst
+++ b/Documentation/bluetooth/card10.rst
@@ -213,3 +213,33 @@ Accessing services from a linux system is possible via ``btgatt-client``. The in
 
     # if this error appears remove and re-pair:
     [GATT client]# Device disconnected: Software caused connection abort
+    
+
+ARM Cordio Sources
+------------------
+
+The BLE stack is based on the ARM Cordio stack. This stack has been developed by a 3rd party and was bought by ARM and open-sourced.
+
+There are many copies of it floating around on the Internet and some are more up to date than others. To keep track here is a list:
+ - mbed
+    - mbed has a reasonably up to date version of the stack in their GitHub repository.
+    - It is scattered below the CORDIO directories in https://github.com/ARMmbed/mbed-os/tree/master/features/FEATURE_BLE/targets
+    - ble-profiles are not included. mbed has written their own adaptation layer to interface with the stack and implements profiles in C++
+ - Ambiq Suite SDK
+    - Can be found here: https://github.com/sparkfun/AmbiqSuiteSDK/tree/master/third_party/exactle
+    - Patches on top might be here: https://support.ambiqmicro.com/hc/en-us/categories/115000239012-Software
+    - Reasonably up to date
+    - Intersting part: has their own FreeRTOS integration (but apparently on older WSF)
+    - BLE 5.1 (?)
+ - Packetcraft
+    - Apparently tasked with maintaining the stack in general
+    - Most up to date version
+    - https://github.com/packetcraft-inc/cordio
+    - Apparently developing (security) fixes, distributing them to customers, but not applying them to master: https://github.com/ARMmbed/mbed-os/commit/c92777311578eb003b4546c4e5e6f2c1f8ba3c84
+    - BLE 5.1
+ - Maxim
+    - Distributed via Maxim Toolchain Installation tool, no repository available
+    - Contains software implementation of the base band
+    - ble-host and ble-profiles might be compatible with the one directly from Packetcraft
+    - Developing their own low-power enhancements
+    - BLE 5.0