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diff --git a/docs/manual/adding-packages-directory.txt b/docs/manual/adding-packages-directory.txt
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+++ b/docs/manual/adding-packages-directory.txt
@@ -298,6 +298,16 @@ management, use this format:
foo needs udev /dev management and a toolchain w/ featA, featB, featC
--------------------------
+==== Dependencies on features provided by virtual packages
+
+Some features can be provided by more than one package, such as the
+openGL libraries.
+
+See xref:virtual-package-tutorial[] for more on the virtual packages.
+
+See xref:virtual-package-list[] for the symbols to depend on if your package
+depends on a feature provided by a virtual package.
+
=== The +.mk+ file
[[adding-packages-mk]]
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