diff --git a/.gitignore b/.gitignore
index 34b5d1d..1bc8379 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,4 +23,9 @@ target
 prompts/
 
 *.DS_Store
-book/
+
+# mdBook build output at repo root
+/book/
+# Keep docs/book source tracked
+!docs/book/
+!docs/book/**