diff --git a/docs/getting_started/build-options.rst b/docs/getting_started/build-options.rst
index 0424287..b02f788 100644
--- a/docs/getting_started/build-options.rst
+++ b/docs/getting_started/build-options.rst
@@ -290,6 +290,7 @@
    RMM_HTML_COV_REPORT		,ON | OFF		,ON			,"Enable HTML output report for coverage analysis"
    RMM_CBMC_VIEWER_OUTPUT	,ON | OFF		,OFF			,"Generate report of CBMC results using the tool cbmc-viewer"
    RMM_CBMC_SINGLE_TESTBENCH	,			,OFF			,"Run CBMC on a single testbench instead on all of them"
+   RMM_CCA_DA			,ON | OFF		,OFF			,"Enable Device Assignment support in RMM (experimental)"
 
 .. _llvm_build:
 
diff --git a/docs/readme.rst b/docs/readme.rst
index 3278e46..0383d1c 100644
--- a/docs/readme.rst
+++ b/docs/readme.rst
@@ -71,8 +71,9 @@
 
 The `TF-RMM`_ project requires to be linked with certain other 3rd party
 projects and they are to be cloned from their repositories into ``ext`` folder
-before building. The projects are `MbedTLS`_, `t_cose`_, `QCBOR`_ and
-`CppUTest`_.
+before building. The projects are `MbedTLS`_, `t_cose`_, `QCBOR`_,
+`CppUTest`_ and `libspdm`_. `libspdm`_ repository is fetched during config phase
+when RMM_CCA_DA build option is enabled.
 
 The project also contains files which are imported from other projects
 into the source tree and may have a different license. Such files with
@@ -128,5 +129,6 @@
 .. _License and Copyright for Contributions: https://tf-rmm.readthedocs.io/en/latest/process/contributing.html#license-and-copyright-for-contributions
 .. _Contributor's Guide: https://tf-rmm.readthedocs.io/en/latest/process/contributing.html
 .. _CppUTest: https://github.com/cpputest/cpputest.git
+.. _libspdm: https://github.com/DMTF/libspdm.git
 .. _Trusted Firmware: https://www.trustedfirmware.org/
 .. _TF-RMM: https://www.trustedfirmware.org/projects/tf-rmm/