1 files changed, 4 insertions, 0 deletions
diff --git a/lib/README b/lib/README
index dacd3fd6..adaeebc3 100644
--- a/lib/README
+++ b/lib/README
@@ -54,6 +54,10 @@ The stm32f4 directory contains code from STMicroelectronics:
   http://www.st.com/en/embedded-software/stm32cubef4.html
 version 1.24.0 (extracted 20190723).
 
+The rp2040 directory contains code from the pico sdk:
+  https://github.com/raspberrypi/pico-sdk.git
+version 1.2.0 (bfcbefafc5d2a210551a4d9d80b4303d4ae0adf7).
+
 The hub-ctrl directory contains code from:
   https://github.com/codazoda/hub-ctrl.c/
 revision 42095e522859059e8a5f4ec05c1e3def01a870a9.