diff --git a/books/book_ideas.md b/books/book_ideas.md
index 1a92ca4e..d006ced5 100644
--- a/books/book_ideas.md
+++ b/books/book_ideas.md
@@ -7,4 +7,5 @@
 - [ ] CVS by tutorials
 - [ ] Fortran for fun and profit
 - [x] RxSwift by tutorials
-- [ ] Mastering git
+- [x] Mastering git
+- [x] Care and feeding of developers.”