diff --git a/README.md b/README.md
index 4279d7b..100f82f 100644
--- a/README.md
+++ b/README.md
@@ -28,10 +28,24 @@ In the TUI, type `/models` to select a model from the registered weave models.
 
 ## Layout
 
-- `config/opencode/` - image: Dockerfile + baked `opencode.json`
+- `config/opencode/` - image: Dockerfile + `opencode.json` (mounted live, see below)
 - `data/` - persisted opencode state (gitignored)
 - `docker-compose.yml` - opencode service
 
+## Updating the config
+
+`opencode.json` is mounted into the container, so edits take effect with a restart — no rebuild needed:
+
+```
+drc restart opencode
+```
+
+Rebuild only when changing the `Dockerfile` or installed packages:
+
+```
+drc build opencode
+```
+
 ## Caveats
 
 - Copy from the TUI is weird over Docker: To copy text out of the opencode TUI running in a container, I have to do `Shift`+click to select the text, then `Ctrl`+`Shift`+`C` to copy. Plain `COPY` doesn't work.
diff --git a/docker-compose.yml b/docker-compose.yml
index 7ab8b14..e51d0ee 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -5,3 +5,4 @@ services:
     build: ./config/opencode/
     volumes:
       - ./data/opencode/share:/root/.local/share/opencode
+      - ./config/opencode/opencode.json:/root/.config/opencode/opencode.json