diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index 778587f7d2..43b387c749 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -1176,18 +1176,19 @@ Core layer for images cannot be removed
a directory that has the same name as the corresponding
append file.
- When using the FILESEXTRAPATHS,
+ When extending FILESEXTRAPATHS,
be sure to use the immediate expansion
- (:=) operator and include
- the trailing separating colon character.
+ (:=) operator.
Immediate expansion makes sure that BitBake evaluates
THISDIR at the time the directive
is encountered rather than at some later time when
expansion might result in a directory that does not
- contain the files you need.
+ contain the files you need.
+ Also, include the trailing separating colon
+ character if you are prepending.
The trailing colon character is necessary because you
are directing BitBake to extend the path by prepending
- directories to the search path.
+ directories to the search path.
Here is another common use: