diff --git a/.gitignore b/.gitignore
index 1baac08..768fc06 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,8 +14,3 @@ desktop.ini
 /composer.lock
 /composer.phar
 /vendor
-
-# Build system
-/_build/phpdoc
-/_build/phpdoc.cache
-/_build/deploy-*.git
diff --git a/_build/.gitignore b/_build/.gitignore
new file mode 100644
index 0000000..41c43ff
--- /dev/null
+++ b/_build/.gitignore
@@ -0,0 +1,4 @@
+# Ignore temporary directories created while building/deploying Pico
+/phpdoc
+/phpdoc.cache
+/deploy-*.git