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-rw-r--r--doc/manual/expressions/builtins.xml4
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/manual/expressions/builtins.xml b/doc/manual/expressions/builtins.xml
index 54f697d852e3..c7a7b49be9f7 100644
--- a/doc/manual/expressions/builtins.xml
+++ b/doc/manual/expressions/builtins.xml
@@ -459,7 +459,9 @@ stdenv.mkDerivation {
       <literal>"unknown"</literal> (for other kinds of files such as
       device nodes or fifos — but note that those cannot be copied to
       the Nix store, so if the predicate returns
-      <literal>true</literal> for them, the copy will fail).</para>
+      <literal>true</literal> for them, the copy will fail). If you
+      exclude a directory, the entire corresponding subtree of
+      <replaceable>e2</replaceable> will be excluded.</para>
 
     </listitem>