diff --git a/documentation/ref-manual/ref-classes.xml b/documentation/ref-manual/ref-classes.xml
index daedf8becc..647c67f2ba 100644
--- a/documentation/ref-manual/ref-classes.xml
+++ b/documentation/ref-manual/ref-classes.xml
@@ -1468,6 +1468,8 @@
         the OpenEmbedded build process.
         <note>
             This class is currently unmaintained.
+            The <filename>strace</filename> package needs to be installed
+            in the build host as a dependency for this tool.
         </note>
     </para>
 </section>