diff --git a/documentation/dev-manual/dev-manual-bsp-appendix.xml b/documentation/dev-manual/dev-manual-bsp-appendix.xml
index 035549431f..7c961bfd6a 100644
--- a/documentation/dev-manual/dev-manual-bsp-appendix.xml
+++ b/documentation/dev-manual/dev-manual-bsp-appendix.xml
@@ -304,7 +304,8 @@
             Now we will take a look at the recipes in your new layer.  
             The standard BSP structure has areas for BSP, graphics, core, and kernel recipes.  
             When you create a BSP, you use these areas for appropriate recipes and append files.  
-            Recipes take the form of <filename>.bb</filename> files.  
+            Recipes take the form of <filename>.bb</filename> files, while append files take
+            the form of <filename>.bbappend</filename> files.  
             If you want to leverage the existing recipes the Yocto Project build system uses
             but change those recipes, you can use <filename>.bbappend</filename> files.  
             All new recipes and append files for your layer must go in the layer’s