diff --git a/.scatterer.toml.example b/.scatterer.toml.example
index 43a8dee..7d18658 100644
--- a/.scatterer.toml.example
+++ b/.scatterer.toml.example
@@ -3,7 +3,7 @@
 agent = "pi"
 
 # Tab 1, right pane
-hunk = "hunk"
+hunk = "hunk diff main"
 
 # Tab 2
 runner = "process-compose up"
diff --git a/README.md b/README.md
index 6c4c03a..6280e80 100644
--- a/README.md
+++ b/README.md
@@ -7,11 +7,18 @@ Personal Herdr workflow plugin.
 The `daniel.scatterer.apply-layout` action creates a new Herdr workspace/space
 from the currently focused pane's cwd, then uses Herdr's declarative
 `layout.apply` socket API to make an `agent` tab with `pi` on the left and
-`hunk` on the right.
+`hunk diff main` on the right.
 
 Repeated invocations create another workspace/space. It does not append tabs to
-the workspace you invoked it from. Project config can add extra layout tabs such
-as a runner or git UI.
+the workspace you invoked it from. Project config can override the Hunk command
+or add extra layout tabs such as a runner or git UI.
+
+Hunk theming is best configured through Hunk itself. `theme = "auto"` queries the
+terminal background and picks Hunk's light/dark defaults; `transparent_background
+= true` lets the terminal background show through. Hunk also has a `tokyo-night`
+dark theme, but not a matching Tokyo Night Day theme. Herdr itself supports
+`name = "terminal"` or `dark_name = "tokyo-night"` / `light_name =
+"tokyo-night-day"` in `~/.config/herdr/config.toml`.
 
 ## Quick start
 
@@ -222,7 +229,7 @@ direnv = true
 
 [layout]
 agent = "pi"
-hunk = "hunk"
+hunk = "hunk diff main"
 # Optional per-project tabs. Defaults do not include process-compose or lazygit.
 runner = "process-compose up"
 git = "lazygit"
diff --git a/herdr-plugin.toml b/herdr-plugin.toml
index 9e9faf0..c781080 100644
--- a/herdr-plugin.toml
+++ b/herdr-plugin.toml
@@ -1,6 +1,6 @@
 id = "daniel.scatterer"
 name = "Scatterer"
-version = "0.1.9"
+version = "0.1.10"
 min_herdr_version = "0.7.0"
 description = "Daniel's Herdr workflow/layout plugin."
 platforms = ["macos", "linux"]
diff --git a/src/layout.rs b/src/layout.rs
index d29a10d..ff685e1 100644
--- a/src/layout.rs
+++ b/src/layout.rs
@@ -58,7 +58,7 @@ pub(crate) fn apply_scatterer_layout(
     );
     let agent = agent_override.unwrap_or(agent_default);
     let hunk = config.layout.hunk.as_deref().unwrap_or(
-        "if command -v hunk >/dev/null 2>&1; then hunk; else echo 'hunk not found on PATH'; fi",
+        "if command -v hunk >/dev/null 2>&1; then hunk diff main; else echo 'hunk not found on PATH'; fi",
     );
     let runner = optional_command(config.layout.runner.as_deref());
     let git = optional_command(config.layout.git.as_deref());