diff --git a/chapter08/libffi.xml b/chapter08/libffi.xml
index 3e534482f..969865c94 100644
--- a/chapter08/libffi.xml
+++ b/chapter08/libffi.xml
@@ -96,6 +96,9 @@
 
 <screen><userinput remap="test">make check</userinput></screen>
 
+    <!-- https://github.com/libffi/libffi/actions/runs/3084390461/jobs/4986488117 -->
+    <para>90 tests are known to fail on ARM64.</para>
+
     <para>Install the package:</para>
 
 <screen><userinput remap="install">make install</userinput></screen>