diff --git a/man/org.freedesktop.import1.xml b/man/org.freedesktop.import1.xml
index 7b5d4a1557..3ef6264281 100644
--- a/man/org.freedesktop.import1.xml
+++ b/man/org.freedesktop.import1.xml
@@ -157,7 +157,7 @@ node /org/freedesktop/import1 {
       available. The file descriptor argument is followed by a local name for the image. This should be a
       name suitable as a hostname and will be used to name the imported image below
       <filename>/var/lib/machines/</filename>. A tar import is placed as a directory tree or a
-      <citerefentry project="man-pages"><refentrytitle>btrfs</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+      <citerefentry project="url"><refentrytitle url="https://btrfs.readthedocs.io/en/latest/btrfs.html">btrfs</refentrytitle><manvolnum>8</manvolnum></citerefentry>
       subvolume below <filename>/var/lib/machines/</filename> under the specified name with no suffix
       appended. A raw import is placed as a file in <filename>/var/lib/machines/</filename> with the
       <filename>.raw</filename> suffix appended. If the <option>force</option> argument is true, any
diff --git a/man/systemd-dissect.xml b/man/systemd-dissect.xml
index 3c758ba62e..a17111cb7d 100644
--- a/man/systemd-dissect.xml
+++ b/man/systemd-dissect.xml
@@ -237,7 +237,7 @@
         capabilities, MAC labels,
         <citerefentry project='man-pages'><refentrytitle>chattr</refentrytitle><manvolnum>1</manvolnum></citerefentry>
         file flags,
-        <citerefentry project='url'><refentrytitle url='https://btrfs.wiki.kernel.org/index.php/Manpage/btrfs(5)'>btrfs</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+        <citerefentry project='url'><refentrytitle url='https://btrfs.readthedocs.io/en/latest/btrfs-man5.html'>btrfs</refentrytitle><manvolnum>5</manvolnum></citerefentry>
         subvolume information, and various other file metadata. File content information is shown via a
         SHA256 digest. Additional fields might be added in future. Note that inode information such as link
         counts, inode numbers and timestamps is excluded from the output on purpose, as it typically
diff --git a/man/systemd-fsck@.service.xml b/man/systemd-fsck@.service.xml
index fc804374ee..78c661bfad 100644
--- a/man/systemd-fsck@.service.xml
+++ b/man/systemd-fsck@.service.xml
@@ -111,7 +111,7 @@
       <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
       <citerefentry project='man-pages'><refentrytitle>fsck</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
       <citerefentry><refentrytitle>systemd-quotacheck.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
-      <citerefentry project='man-pages'><refentrytitle>fsck.btrfs</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+      <citerefentry project='url'><refentrytitle url='https://btrfs.readthedocs.io/en/latest/fsck.btrfs.html'>fsck.btrfs</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
       <citerefentry project='man-pages'><refentrytitle>fsck.cramfs</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
       <citerefentry project='man-pages'><refentrytitle>fsck.ext4</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
       <citerefentry project='man-pages'><refentrytitle>fsck.fat</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
diff --git a/man/systemd-gpt-auto-generator.xml b/man/systemd-gpt-auto-generator.xml
index d962ac63f7..db51076412 100644
--- a/man/systemd-gpt-auto-generator.xml
+++ b/man/systemd-gpt-auto-generator.xml
@@ -322,7 +322,7 @@
       <citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
       <citerefentry project='die-net'><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
       <citerefentry project='man-pages'><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
-      <citerefentry project='man-pages'><refentrytitle>btrfs</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+      <citerefentry project='url'><refentrytitle url='https://btrfs.readthedocs.io/en/latest/btrfs.html'>btrfs</refentrytitle><manvolnum>8</manvolnum></citerefentry>
     </para>
   </refsect1>
 
diff --git a/man/systemd-makefs@.service.xml b/man/systemd-makefs@.service.xml
index 1eedb77a84..51409ba2a3 100644
--- a/man/systemd-makefs@.service.xml
+++ b/man/systemd-makefs@.service.xml
@@ -57,7 +57,7 @@
     each filesystem type (<filename>/sbin/mkfs.<replaceable>type</replaceable></filename>
     or <filename>/sbin/mkswap</filename>). For certain file system types (currently
     ext2/ext3/<citerefentry project='man-pages'><refentrytitle>ext4</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
-    <citerefentry project='url'><refentrytitle url='https://btrfs.wiki.kernel.org/index.php/Manpage/btrfs(5)'>btrfs</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+    <citerefentry project='url'><refentrytitle url='https://btrfs.readthedocs.io/en/latest/btrfs-man5.html'>btrfs</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
     <citerefentry project='man-pages'><refentrytitle>xfs</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
     f2fs, vfat) and for swap devices, it will configure reasonable defaults and set
     the file system label and UUID based on the device name.</para>
@@ -70,7 +70,7 @@
     number specific to each file system, so only certain types are supported.
     Currently:
     <citerefentry project='man-pages'><refentrytitle>ext4</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
-    <citerefentry project='url'><refentrytitle url='https://btrfs.wiki.kernel.org/index.php/Manpage/btrfs(5)'>btrfs</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+    <citerefentry project='url'><refentrytitle url='https://btrfs.readthedocs.io/en/latest/btrfs-man5.html'>btrfs</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
     <citerefentry project='man-pages'><refentrytitle>xfs</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
     <!-- yes, that's what the man page is called. -->
     and dm-crypt partitions (see
@@ -89,7 +89,7 @@
       <citerefentry><refentrytitle>systemd.mount</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
       <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
       <citerefentry><refentrytitle>systemd-repart</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
-      <citerefentry project='man-pages'><refentrytitle>mkfs.btrfs</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+      <citerefentry project='url'><refentrytitle url='https://btrfs.readthedocs.io/en/latest/mkfs.btrfs.html'>mkfs.btrfs</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
       <citerefentry project='man-pages'><refentrytitle>mkfs.cramfs</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
       <citerefentry project='man-pages'><refentrytitle>mkfs.ext4</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
       <citerefentry project='man-pages'><refentrytitle>mkfs.fat</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
diff --git a/man/systemd-nspawn.xml b/man/systemd-nspawn.xml
index c7c66cd271..248105ffec 100644
--- a/man/systemd-nspawn.xml
+++ b/man/systemd-nspawn.xml
@@ -1900,7 +1900,7 @@ After=sys-subsystem-net-devices-ens1.device</programlisting>
       <citerefentry project='mankier'><refentrytitle>zypper</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
       <citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
       <citerefentry><refentrytitle>machinectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
-      <citerefentry project='man-pages'><refentrytitle>btrfs</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+      <citerefentry project='url'><refentrytitle url='https://btrfs.readthedocs.io/en/latest/btrfs.html'>btrfs</refentrytitle><manvolnum>8</manvolnum></citerefentry>
     </para>
   </refsect1>
 
diff --git a/man/systemd.exec.xml b/man/systemd.exec.xml
index 8db8deb36d..8de96e1be8 100644
--- a/man/systemd.exec.xml
+++ b/man/systemd.exec.xml
@@ -233,7 +233,7 @@
         <para>To make sure making ephemeral copies can be made efficiently, the root directory or root image
         should be located on the same filesystem as <filename>/var/lib/systemd/ephemeral-trees/</filename>.
         When using <varname>RootEphemeral=</varname> with root directories,
-        <citerefentry project='url'><refentrytitle url='https://btrfs.wiki.kernel.org/index.php/Manpage/btrfs(5)'>btrfs</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+        <citerefentry project='url'><refentrytitle url='https://btrfs.readthedocs.io/en/latest/btrfs-man5.html'>btrfs</refentrytitle><manvolnum>5</manvolnum></citerefentry>
         should be used as the filesystem and the root directory should ideally be a subvolume which
         <command>systemd</command> can snapshot to make the ephemeral copy. For root images, a filesystem
         with support for reflinks should be used to ensure an efficient ephemeral copy.</para>
diff --git a/man/tmpfiles.d.xml b/man/tmpfiles.d.xml
index e06da2b661..38999ec00e 100644
--- a/man/tmpfiles.d.xml
+++ b/man/tmpfiles.d.xml
@@ -241,9 +241,9 @@ L     /tmp/foobar -    -    -     -   /dev/null</programlisting>
           non-btrfs file systems, this line type is identical to <varname>d</varname>.</para>
 
           <para>If the subvolume already exists, no change to the quota hierarchy is made, regardless of whether the
-          subvolume is already attached to a quota group or not. Also see <varname>Q</varname> below. See <citerefentry
-          project='die-net'><refentrytitle>btrfs-qgroup</refentrytitle><manvolnum>8</manvolnum></citerefentry> for
-          details about the btrfs quota group concept.</para>
+          subvolume is already attached to a quota group or not. Also see <varname>Q</varname> below. See
+          <citerefentry project='url'><refentrytitle url='https://btrfs.readthedocs.io/en/latest/btrfs-qgroup.html'>btrfs-qgroup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+          for details about the btrfs quota group concept.</para>
 
           <xi:include href="version-info.xml" xpointer="v228"/></listitem>
         </varlistentry>
@@ -900,8 +900,8 @@ e! /var/cache/krb5rcache - - - 0
       <citerefentry project='man-pages'><refentrytitle>setfacl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
       <citerefentry project='man-pages'><refentrytitle>getfacl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
       <citerefentry project='man-pages'><refentrytitle>chattr</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
-      <citerefentry project='die-net'><refentrytitle>btrfs-subvolume</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
-      <citerefentry project='die-net'><refentrytitle>btrfs-qgroup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+      <citerefentry project='url'><refentrytitle url='https://btrfs.readthedocs.io/en/latest/btrfs-subvolume.html'>btrfs-subvolume</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+      <citerefentry project='url'><refentrytitle url='https://btrfs.readthedocs.io/en/latest/btrfs-qgroup.html'>btrfs-qgroup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
     </para>
   </refsect1>