diff --git a/documentation/ref-manual/usingpoky.xml b/documentation/ref-manual/usingpoky.xml
index 0ab19fd1a6..5a6a4068a7 100644
--- a/documentation/ref-manual/usingpoky.xml
+++ b/documentation/ref-manual/usingpoky.xml
@@ -679,9 +679,11 @@
                         The files are defined by
                         <link linkend='var-BUILDHISTORY_IMAGE_FILES'><filename>BUILDHISTORY_IMAGE_FILES</filename></link>.
                         </para></listitem>
-                    <listitem><para><filename>build-id:</filename>
+                    <listitem><para><filename>build-id.txt:</filename>
                         Human-readable information about the build configuration
-                        and metadata source revisions.</para></listitem>
+                        and metadata source revisions.
+                        This file contains the full build header as printed
+                        by BitBake.</para></listitem>
                     <listitem><para><filename>*.dot:</filename>
                         Dependency graphs for the image that are
                         compatible with <filename>graphviz</filename>.