diff --git a/docs/manual/customize-directory-structure.txt b/docs/manual/customize-directory-structure.txt
index b177319f98..a3a7ad4cb9 100644
--- a/docs/manual/customize-directory-structure.txt
+++ b/docs/manual/customize-directory-structure.txt
@@ -50,6 +50,7 @@ to you.
 |
 +-- Config.in (if using a br2-external tree)
 +-- external.mk (if using a br2-external tree)
++-- external.desc (if using a br2-external tree)
 ------
 
 Details on the files shown above are given further in this chapter.