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-rw-r--r--doc/manual/nix-collect-garbage.xml1
1 files changed, 1 insertions, 0 deletions
diff --git a/doc/manual/nix-collect-garbage.xml b/doc/manual/nix-collect-garbage.xml
index 14cf97932a87..a13e365a4e00 100644
--- a/doc/manual/nix-collect-garbage.xml
+++ b/doc/manual/nix-collect-garbage.xml
@@ -26,6 +26,7 @@
       <arg choice='plain'><option>--print-dead</option></arg>
       <arg choice='plain'><option>--delete</option></arg>
     </group>
+    <arg><option>--dry-run</option></arg>
   </cmdsynopsis>
 </refsynopsisdiv>