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-rw-r--r--doc/manual/command-ref/opt-common.xml11
1 files changed, 6 insertions, 5 deletions
diff --git a/doc/manual/command-ref/opt-common.xml b/doc/manual/command-ref/opt-common.xml
index 3486c7e7d852..c7e8ae1ed05f 100644
--- a/doc/manual/command-ref/opt-common.xml
+++ b/doc/manual/command-ref/opt-common.xml
@@ -351,13 +351,14 @@
 </varlistentry>
 
 
-<varlistentry><term><option>-I</option> <replaceable>path</replaceable></term>
+<varlistentry xml:id="opt-I"><term><option>-I</option> <replaceable>path</replaceable></term>
 
   <listitem><para>Add a path to the Nix expression search path.  This
-  option may be given multiple times.  See the <envar>NIX_PATH</envar>
-  environment variable for information on the semantics of the Nix
-  search path.  Paths added through <option>-I</option> take
-  precedence over <envar>NIX_PATH</envar>.</para></listitem>
+  option may be given multiple times.  See the <envar
+  linkend="env-NIX_PATH">NIX_PATH</envar> environment variable for
+  information on the semantics of the Nix search path.  Paths added
+  through <option>-I</option> take precedence over
+  <envar>NIX_PATH</envar>.</para></listitem>
 
 </varlistentry>