--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Docs/uids.md	Fri Aug 02 21:20:00 2019 +0200
@@ -0,0 +1,17 @@
+Vanilla Linux reserved UIDs and GIDs
+====================================
+
+Users and groups are created once needed at package installation. It's perfectly
+safe to reuse the same UID/GID for different packages (example www, mail).
+
+You may think of UID/GID just like a simple package dependency.
+
+The following UID/GID are defined:
+
+| uid           | gid                | package(s)       |
+|---------------|--------------------|------------------|
+| sshd (100)    | sshd (100)         | network/openssh  |
+| polkitd (101) | polkitd (101)      | security/polkit  |
+| pulse (102)   | pulse (102)        | audio/pulseaudio |
+|               | pulse-rt (103)     | audio/pulseaudio |
+|               | pulse-access (104) | audio/pulseaudio |