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-rw-r--r--doc/manual/nix-env.xml3
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/manual/nix-env.xml b/doc/manual/nix-env.xml
index 02a51c6e9006..a5217450b5a3 100644
--- a/doc/manual/nix-env.xml
+++ b/doc/manual/nix-env.xml
@@ -105,7 +105,8 @@ also <xref linkend="sec-common-options" />.</phrase></para>
 
     <listitem><para>For the <option>--install</option>,
     <option>--upgrade</option>, <option>--uninstall</option>,
-    <option>--switch-generation</option> and
+    <option>--switch-generation</option>,
+    <option>--delete-generations</option> and
     <option>--rollback</option> operations, this flag will cause
     <command>nix-env</command> to print what
     <emphasis>would</emphasis> be done if this flag had not been