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-rw-r--r--doc/manual/troubleshooting.xml2
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diff --git a/doc/manual/troubleshooting.xml b/doc/manual/troubleshooting.xml
index 4179eb8411d3..ebd454a97266 100644
--- a/doc/manual/troubleshooting.xml
+++ b/doc/manual/troubleshooting.xml
@@ -55,7 +55,7 @@ so it just gives up.</para>
 
 <para>Solution: remove one of the offending packages from the user
 environment (if already installed) using <command>nix-env
--u</command>, or specify exactly which version should be installed
+-e</command>, or specify exactly which version should be installed
 (e.g., <literal>nix-env -i docbook-xml-4.2</literal>).</para>
 
 <para>Alternatively, you can modify the user environment builder