diff --git a/README.md b/README.md
index f13915f..fa44028 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,7 @@ Note OED is transitioning to mostly public design documents. The private DevDocs
 - [baseline/baseline.md](./baseline/baseline.md): Add the ability for an admin to add baselines to meters and for users to display on a graphic.
 - [enhancementToGithubAction.md](./githubAction/enhancementToGithubAction.md): securing GitHub action information.
 - [timescaleDB/timescaleDB.md](./timescaleDB/timescaleDB.md): Information on efforts to investigate TimescaleDB usage in OED.
+- [infisicalIntegration/INFISICAL_INTEGRATION.md](./infisicalIntegration/INFISICAL_INTEGRATION.md): Instructions for how to utilize Infisical secrets management to store database passwords.
 
 ## Information
 
diff --git a/infisicalIntegration/INFISICAL_INTEGRATION.md b/infisicalIntegration/INFISICAL_INTEGRATION.md
new file mode 100644
index 0000000..0f1ffc3
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+++ b/infisicalIntegration/INFISICAL_INTEGRATION.md
@@ -0,0 +1,155 @@
+# Infisical Integration Setup for OED
+
+This guide explains how to run OED with optional Infisical-backed database passwords using the current `password-vault` branch changes.
+
+## What This Integration Does
+
+When enabled, OED will load these two values from Infisical at startup and override local environment values:
+
+- `POSTGRES_PASSWORD`
+- `OED_DB_PASSWORD`
+
+All other config values still come from local environment variables.
+
+## 1. Prerequisites
+
+- OED running with Docker Compose
+- Infisical instance reachable from the OED web container (Self-hosting instructions here: https://infisical.com/docs/self-hosting/overview)
+- A Machine Identity in Infisical with at least read access to the required secrets
+- `@infisical/sdk` installed locally in this repository (optional dependency)
+
+Install SDK:
+
+```bash
+npm install @infisical/sdk
+```
+
+## 2. Create Secrets in Infisical
+
+In your Infisical project, create these exact secret names:
+
+- `POSTGRES_PASSWORD`
+- `OED_DB_PASSWORD`
+
+Put them in the environment/path your OED config will reference.
+
+## 3. Collect Infisical Credentials
+
+From Infisical, get:
+
+- `INFISICAL_CLIENT_ID` (Universal Auth client ID)
+- `INFISICAL_CLIENT_SECRET` (Universal Auth client secret)
+- `INFISICAL_PROJECT_ID`
+
+## 4. Configure OED Environment Variables
+
+Set these in your `.env`:
+
+```env
+INFISICAL_CLIENT_ID=...
+INFISICAL_CLIENT_SECRET=...
+INFISICAL_PROJECT_ID=...
+INFISICAL_SITE_URL=...
+INFISICAL_ENVIRONMENT=dev
+INFISICAL_PATH=/
+```
+
+Notes:
+
+- `INFISICAL_SITE_URL` defaults to `https://app.infisical.com` if not set.
+- `INFISICAL_ENVIRONMENT` defaults to `dev` if not set.
+- `INFISICAL_PATH` defaults to `/` if not set.
+
+## 5. Enable Vault Loading in Docker Compose
+
+In the web service environment, set:
+
+```yaml
+- PASSWORD_VAULT=yes
+```
+
+Keep this as `no` to disable vault loading and use only local env values.
+
+## 6. Self-Hosted Infisical URL Notes
+
+If Infisical is self-hosted and exposed on the Docker host, set:
+
+```env
+INFISICAL_SITE_URL=http://host.docker.internal:80
+```
+
+Validate connectivity from OED web container:
+
+```bash
+docker compose run --rm web sh -lc "curl -sS -I --max-time 8 http://host.docker.internal:80 | head -n 1"
+```
+
+Expected: HTTP response line (for example `HTTP/1.1 200 OK`).
+
+## 7. Rebuild and Start
+
+```bash
+docker compose down
+docker compose up
+```
+
+## 8. Verify OED Is Actually Using Vault Values
+
+Run this override check. It intentionally injects wrong local password values and confirms they are replaced by Infisical values:
+
+```bash
+set -a && . ./.env && set +a
+
+docker compose run --rm \
+  -e PASSWORD_VAULT=yes \
+  -e INFISICAL_CLIENT_ID \
+  -e INFISICAL_CLIENT_SECRET \
+  -e INFISICAL_PROJECT_ID \
+  -e INFISICAL_SITE_URL \
+  -e INFISICAL_ENVIRONMENT \
+  -e INFISICAL_PATH \
+  -e OED_DB_PASSWORD=__definitely_wrong_local_value__ \
+  -e POSTGRES_PASSWORD=__definitely_wrong_local_value__ \
+  web node -e "
+    const localOed = process.env.OED_DB_PASSWORD;
+    const localPg = process.env.POSTGRES_PASSWORD;
+    require('./src/server/util/loadInfisicalSecrets')();
+    console.log('OED_DB_PASSWORD=' + (process.env.OED_DB_PASSWORD === localOed ? 'NOT_OVERRIDDEN' : 'OVERRIDDEN_FROM_VAULT'));
+    console.log('POSTGRES_PASSWORD=' + (process.env.POSTGRES_PASSWORD === localPg ? 'NOT_OVERRIDDEN' : 'OVERRIDDEN_FROM_VAULT'));
+  "
+```
+
+Expected:
+
+- `OED_DB_PASSWORD=OVERRIDDEN_FROM_VAULT`
+- `POSTGRES_PASSWORD=OVERRIDDEN_FROM_VAULT`
+
+## 9. Troubleshooting
+
+### `@infisical/sdk is not installed`
+
+Install SDK in repo root:
+
+```bash
+npm install @infisical/sdk
+```
+
+### `StatusCode=401 Invalid credentials`
+
+Usually caused by bad Universal Auth pair.
+
+- Regenerate client ID/client secret for the Machine Identity.
+- Ensure you copied Universal Auth credentials, not some other identifier.
+
+### `spawnSync ... ETIMEDOUT`
+
+Network/path to Infisical is not reachable from OED web container.
+
+- Fix `INFISICAL_SITE_URL` to a reachable endpoint.
+- Confirm with `curl` from a `docker compose run --rm web ...` command.
+
+## 10. Operational Note for Password Rotation
+
+The existing `changePostgresPassword` script updates DB and local `.env` values; it does not automatically write back to Infisical.
+
+If `PASSWORD_VAULT=yes`, update Infisical secrets after rotating passwords so startup values stay in sync.
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