diff --git a/doc/manual/nix-env.xml b/doc/manual/nix-env.xml
index cc33ef3be..02a51c6e9 100644
--- a/doc/manual/nix-env.xml
+++ b/doc/manual/nix-env.xml
@@ -121,11 +121,9 @@ also .
systemBy default, operations such as only include derivations matching the current
- platform. This option allows you to use derivations for the
- specified platform system. The special
- value * causes derivations for any platform to
- be included.
+ --available show derivations matching any platform. This
+ option allows you to use derivations for the specified platform
+ system.