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: