Update README.md

README.md

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 # MonoReaper
 
-Merge github repositories into a monorepo directory while preserving commit history.
+Merge GitHub repositories into a monorepo directory while preserving commit history.
 
 ## Usage
 
@@ -31,3 +31,18 @@ MONOREPO_DIR=path/to/my/monorepo bash monoreaper.sh user/repo0 user/repo1
 ```
 
 Note that the `MONOREPO_DIR` must have `master` as default branch.
+
+
+## Why monorepos?
+
+- Streamlines ops logic like doing CICD. The overhead of setting up pipelines and deployments is cumbersome.
+- Shared codebase introduces shared ownership, naming and style.
+- Dependencies across services are easier to manage.
+- Searching code across multiple repos is a hassle.
+- Lots of great tools that take advantage of monorepos:
+  - [pull-review](https://github.com/imsky/pull-review): automate pull reviews with lots of configuration options.
+  - [buildpipe](https://github.com/ksindi/buildpipe): customizing pipeline logic by looking at git changes in projects.
+- Lots of anecdotal evidence:
+  - [Optimizing for iteration speed](https://erikbern.com/2017/07/06/optimizing-for-iteration-speed.html)
+  - [Why Google Stores Billions of Lines of Code in a Single Repository](https://research.google.com/pubs/pub45424.html)
+