diff --git a/contributing.md b/contributing.md
index 19c36d0..0118612 100644
--- a/contributing.md
+++ b/contributing.md
@@ -66,10 +66,10 @@ to start fresh.
 ```
 
 This creates:
-- Executed notebooks, generated from eligible Markdown files, under `build/juptyer_execute/`
-- HTML under `build/html/`
+- Executed notebooks, generated from eligible Markdown files, under `_build/juptyer_execute/`
+- HTML under `_build/html/`
 
-Open `build/html/index.html` in a web browser.
+Open `_build/html/index.html` in a web browser.
 
 ## Develop
 
diff --git a/pixi.toml b/pixi.toml
index c23c754..c3c4bd2 100644
--- a/pixi.toml
+++ b/pixi.toml
@@ -21,7 +21,7 @@ build = { cmd = [
     "-T",  # show tracebacks
     "--keep-going",  # do not stop on error
 ] }
-clean = "rm -rf build/*"
+clean = "rm -rf _build/*"
 start = "jupyter lab"
 
 [activation]