diff --git a/docs/getting_started/build-options.rst b/docs/getting_started/build-options.rst
index c520e0c..5935b4e 100644
--- a/docs/getting_started/build-options.rst
+++ b/docs/getting_started/build-options.rst
@@ -22,6 +22,10 @@
    directory containing the SP source, relative to the ``bl32/``; the directory
    is expected to contain a makefile called ``<aarch32_sp-value>.mk``.
 
+-  ``AMU_RESTRICT_COUNTERS``: Register reads to the group 1 counters will return
+   zero at all but the highest implemented exception level.  Reads from the
+   memory mapped view are unaffected by this control.
+
 -  ``ARCH`` : Choose the target build architecture for TF-A. It can take either
    ``aarch64`` or ``aarch32`` as values. By default, it is defined to
    ``aarch64``.