diff --git a/documentation/ref-manual/usingpoky.xml b/documentation/ref-manual/usingpoky.xml
index a7bf32d451..89b3437721 100644
--- a/documentation/ref-manual/usingpoky.xml
+++ b/documentation/ref-manual/usingpoky.xml
@@ -951,6 +951,19 @@
         * PR changed from "r0" to "r1"
         * PV changed from "0.1.10" to "0.1.12"
                 </literallayout>
+                <note>
+                    The <filename>buildhistory-diff</filename> tool requires
+                    the <filename>GitPython</filename> package.
+                    Be sure to install it using Pip3 as follows:
+                    <literallayout class='monospaced'>
+   $ pip3 install GitPython --user
+                    </literallayout>
+                    Alternatively, you can install
+                    <filename>python3-3</filename> using the appropriate
+                    distribution package manager (e.g.
+                    <filename>apt-get</filename>, <filename>dnf</filename>, or
+                    <filename>zipper</filename>).
+                </note>
             </para>
 
             <para>