From dbd4e0a6871fde78e5eea758db569586f7ef483a Mon Sep 17 00:00:00 2001
From: Michael Wolf <mw@philologue.net>
Date: Sat, 7 Feb 2026 16:55:54 -0500
Subject: [PATCH] Add a note re necessary software

---
 README.md | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/README.md b/README.md
index ce4ffce..e630b6d 100644
--- a/README.md
+++ b/README.md
@@ -49,6 +49,16 @@ enough libc to run golang binaries.
 
 To run a more complete system, you also need to have docker compose installed.
 
+### Database
+
+To connect to the database, you need psql (PostgreSQL client, for
+`./diachron/common.d/db`)
+
+- macOS: `brew install libpq` (and follow the caveat to add it to your PATH),
+  or `brew install postgresql`
+- Debian/Ubuntu: `apt install postgresql-client`
+- Fedora/RHEL: `dnf install postgresql`
+
 ### Development requirements
 
 To hack on diachron itself, you need the following: