diff --git a/docs/book/build.txt b/docs/book/build.txt
index 4b8cde76..b956eecc 100644
--- a/docs/book/build.txt
+++ b/docs/book/build.txt
@@ -7,7 +7,7 @@ We will now provide a detailed description of the build phase, which is used for
 ==== Build order and dependencies
 
 To illustrate the various concepts that are part of the build process, we are now going to use a new example.
-The files +foo.txt+ and +bar.txt+ will be created by copying the file +wscript+, and the file +foobar.txt+ will be created from the concatenation of the generated files. Here is a summary: footnote:[The examples are provided for demonstration purposes. It is actually considered a best practice to avoid copying files]
+The files +foo.txt+ and +bar.txt+ will be created by copying the file +wscript+, and the file +foobar.txt+ will be created from the concatenation of the generated files. Here is a summary: footnote:[It is actually considered a best practice to avoid copying files. When this is required, consider installing files or re-using the examples provided under the folder `demos/subst` of the source ditribution.]
 
 [source,shishell]
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