diff --git a/etc/systemd/system/README.md b/etc/systemd/system/README.md
index 7d15b68b..97505db1 100644
--- a/etc/systemd/system/README.md
+++ b/etc/systemd/system/README.md
@@ -1,19 +1,9 @@
-Subdirectories of this directory shouldn't exist unless they are .wants
+Systemd services. These are sorted by some kind of category into
+subdirectories. The sudirectories won't exist in the real
+`/etc/systemd/system` unless they end `.wants` or something similar
+and I forget to update this README file if that happens.
 
-## IPv6-files
-
-The IPv6 files are copied from https://www.reddit.com/r/raspberry_pi/comments/14vcpz/rpi_as_an_ipv6_router_using_a_sixxs_tunnel_and/
-  and they are here because they were my biggest difficulty with having
-Arch on Pi as IPv6 router.
-    * Also helpful
-      https://wiki.archlinux.org/index.php/IPv6_tunnel_broker_setup
-
-## ydns-simple
-
-ydns-simple.\* are for https://github.com/Mikaela/scripts/blob/gh-pages/bash/ydns-simple and I am just curious and want to avoid installing cron to my
-phone.
-
-## also interesting
+## Worth reading
 
 * Waiting for network devices to have IP address (**I only use this for
 cables**) https://wiki.freedesktop.org/www/Software/systemd/NetworkTarget/#cutthecraphowdoimakenetwork.targetworkforme
diff --git a/etc/systemd/system/ipv6/README.md b/etc/systemd/system/ipv6/README.md
new file mode 100644
index 00000000..03904876
--- /dev/null
+++ b/etc/systemd/system/ipv6/README.md
@@ -0,0 +1,10 @@
+The IPv6 files are copied from
+https://www.reddit.com/r/raspberry_pi/comments/14vcpz/rpi_as_an_ipv6_router_using_a_sixxs_tunnel_and/
+and they are here because they were my biggest difficulty with having Arch
+on Pi as IPv6 router.
+    * Also helpful
+      https://wiki.archlinux.org/index.php/IPv6_tunnel_broker_setup
+
+Miredo.service again is edited from what Arch & Debian ship so it starts
+after there is already network connectivity and Unbound is running
+so it won't start complaining about name resolution errors.
diff --git a/etc/systemd/system/sailfish/README.md b/etc/systemd/system/sailfish/README.md
new file mode 100644
index 00000000..1b62db22
--- /dev/null
+++ b/etc/systemd/system/sailfish/README.md
@@ -0,0 +1,7 @@
+Services in this directory are meant for my Jolla Phone which runs
+Sailfish OS. It doesn't have cron, so I tried the nearest equivalent
+that is there out-of-box, systemd timers.
+
+* ydns-simple is my dyndns update script, you can find it from https://github.com/Mikaela/scripts/blob/gh-pages/bash/ydns-simple
+* aliendalvik-stopper again stops android support hourly so it won't waste
+  battery.