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-rw-r--r--nixos/doc/manual/installation/installing.xml5
1 files changed, 5 insertions, 0 deletions
diff --git a/nixos/doc/manual/installation/installing.xml b/nixos/doc/manual/installation/installing.xml
index 94d8e9d2e1a3..b0674307a563 100644
--- a/nixos/doc/manual/installation/installing.xml
+++ b/nixos/doc/manual/installation/installing.xml
@@ -140,6 +140,11 @@
     the GRUB boot loader is to be installed.  Without it, NixOS cannot
     boot.</para>
 
+    <para>If there are other operating systems running on the machine before
+    installing NixOS, the
+    <option>boot.loader.grub.useOSProber</option> option can be set to
+    <literal>true</literal> to automatically add them to the grub menu.</para>
+
     <para>Another critical option is <option>fileSystems</option>,
     specifying the file systems that need to be mounted by NixOS.
     However, you typically don’t need to set it yourself, because