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-rw-r--r--doc/manual/opt-common.xml11
1 files changed, 11 insertions, 0 deletions
diff --git a/doc/manual/opt-common.xml b/doc/manual/opt-common.xml
index 0cfd6ba215d2..7650d62e51ae 100644
--- a/doc/manual/opt-common.xml
+++ b/doc/manual/opt-common.xml
@@ -171,3 +171,14 @@
   </listitem>
 </varlistentry>
 
+
+<varlistentry>
+  <term><option>--readonly-mode</option></term>
+  <listitem>
+    <para>
+      When this option is used, no attempt is made to open the Nix
+      database.  Most Nix operations do need database access, so those
+      operations will fail.
+    </para>
+  </listitem>
+</varlistentry>