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-rw-r--r--doc/manual/nix-collect-garbage.xml11
-rw-r--r--doc/manual/nix-store.xml12
2 files changed, 23 insertions, 0 deletions
diff --git a/doc/manual/nix-collect-garbage.xml b/doc/manual/nix-collect-garbage.xml
index adc6c1e730a7..1de50408e01e 100644
--- a/doc/manual/nix-collect-garbage.xml
+++ b/doc/manual/nix-collect-garbage.xml
@@ -11,6 +11,7 @@
         <arg choice='plain'><option>--print-live</option></arg>
         <arg choice='plain'><option>--print-dead</option></arg>
       </group>
+      <arg><option>--min-age</option> <replaceable>age</replaceable></arg>
     </cmdsynopsis>
   </refsynopsisdiv>
 
@@ -56,6 +57,16 @@
         </listitem>
       </varlistentry>
       
+      <varlistentry>
+        <term><option>--min-age</option> <replaceable>age</replaceable></term>
+        <listitem>
+          <para>
+            This option corresponds to the <option>--min-age</option>
+            option in <command>nix-store <option>--gc</option></command>.
+          </para>
+        </listitem>
+      </varlistentry>
+      
     </variablelist>
 
   </refsection>
diff --git a/doc/manual/nix-store.xml b/doc/manual/nix-store.xml
index febe02fd4ada..522de60d3696 100644
--- a/doc/manual/nix-store.xml
+++ b/doc/manual/nix-store.xml
@@ -147,6 +147,7 @@
           <arg choice='plain'><option>--print-dead</option></arg>
           <arg choice='plain'><option>--delete</option></arg>
         </group>
+        <arg><option>--min-age</option> <replaceable>age</replaceable></arg>
       </cmdsynopsis>
     </refsection>
 
@@ -207,6 +208,17 @@
         Each line should contain exactly one store path.
       </para>
 
+      <para>
+        The option <option>--min-age</option> specifies a minimum time
+        in hours that an unreachable store path must not have been
+        used before it is considered dead.  The default is 0 (consider
+        all unreachable store paths dead).  Whether a store path has
+        been used is determined by looking at its access time
+        (<literal>atime</literal>), so this does not work if the store
+        is located on a file system that has the
+        <literal>noatime</literal> option set.
+      </para>
+
       <warning>
         <para>
           You generally will want to use the command