diff --git a/README.md b/README.md
index ce77ef3..71289c9 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,9 @@
# Tillitis TKey
+Read about current work in progress
+[here](#current-work-in-progress-in-this-repository).
+
 *The TK1 PCB, also known as
TKey.*
@@ -25,11 +28,11 @@ With the right application, the TKey can be used for:
If you want to know more about Tillitis and the TKey, visit:
-- Main web: https://tillitis.se/
-- Shop: https://shop.tillitis.se/
-- Developer Handbook: https://dev.tillitis.se/
-- Officially supported apps: https://tillitis.se/download/
-- Other known apps: https://dev.tillitis.se/projects/
+- Main web:
+- Shop:
+- Developer Handbook:
+- Officially supported apps:
+- Other known apps:
All of the TKey software, firmware, FPGA Verilog code, schematics and
PCB design files are open source, just like all trustworthy security
@@ -56,12 +59,12 @@ releases.
The TKey PCB [KiCad](https://www.kicad.org/) design files are kept in
a separate repository:
-https://github.com/tillitis/tk1-pcba
+
The TP1 (TKey programmer 1) PCB design files and the firmware sources
are kept in:
-https://github.com/tillitis/tp1
+
Note that the TP1 is only used for provisioning the FPGA bitstream
into flash or the FPGA configuration memory. It's not necessary if you
@@ -104,3 +107,15 @@ deterministically generate any cryptographic keys it needs.
The TKey unconditional measured boot is inspired by, but not exactly
the same as part of [TCG
DICE](https://trustedcomputinggroup.org/work-groups/dice-architectures/).
+
+# Current Work in Progress in this repository
+
+We are updating the FPGA and firmware on TKey as part of the Castor
+release. This update will simplify TKey’s usage, laying the groundwork
+for future support of U2F/FIDO authentication.
+
+You can track our progress through this
+[milestone](https://github.com/tillitis/tillitis-key1/milestone/1).
+
+Note that main branch is in development. We try to keep status of main
+branch updated in the [release notes](/doc/release_notes.md#upcoming-release-castor).