diff --git a/docs/src/SUMMARY.md b/docs/src/SUMMARY.md
index ad54dcab..5c5a7c65 100644
--- a/docs/src/SUMMARY.md
+++ b/docs/src/SUMMARY.md
@@ -4,6 +4,7 @@
 - [Documentation](./fastsim-doc.md)
     - [Python](./python-doc.md)
     - [Rust](./rust-doc.md)
+    - [Developers](./developers.md)
 - [Calibration/Validation](./cal_and_val.md)
 - [How to Update This Book](./how-to-update.md)
 - [Release Notes](./release-notes.md)
diff --git a/docs/src/developers.md b/docs/src/developers.md
new file mode 100644
index 00000000..8bacb111
--- /dev/null
+++ b/docs/src/developers.md
@@ -0,0 +1,11 @@
+# How to compile/test Rust code
+
+## cargo build
+`cargo build` will not compile when run in `/rust` due to problems compiling `/rust/fastsim-py`.
+`cargo build` should compile when run in the `/rust/fastsim-core`.
+
+## cargo test
+`cargo test` should compile when run in /rust because there are no tests in `/rust/fastsim-py`.
+
+## build_and_test.sh
+Running `sh build_and_test.sh` from the root fastsim directory compile/tests the Rust code, and tests the Python code. It should compile without errors.
\ No newline at end of file
diff --git a/docs/src/fastsim-doc.md b/docs/src/fastsim-doc.md
index 565f42dc..dfa9a59e 100644
--- a/docs/src/fastsim-doc.md
+++ b/docs/src/fastsim-doc.md
@@ -2,4 +2,6 @@
 
 ## [Python](./python-doc.md)
 
-## [Rust](./rust-doc.md)
\ No newline at end of file
+## [Rust](./rust-doc.md)
+
+## [Developers](./developers.md)
\ No newline at end of file
diff --git a/docs/src/how-to-update.md b/docs/src/how-to-update.md
index 2b0e16c1..5b6ac372 100644
--- a/docs/src/how-to-update.md
+++ b/docs/src/how-to-update.md
@@ -16,7 +16,7 @@ Run the following in the repository root directory:
 
 ## Publishing
 1. Update `book.toml` or files in `docs/src/`
-1. Make sure the docs look good locally by running the steps in [Serving Locally](#serving-locally)
-1. Commit files and push to `main` branch
+1. Make sure the docs look good locally by running the steps in [Serving Locally](#serving-locally).
+1. Commit files and push to `fastsim-2` branch
 
-After that, a GitHub action will build the book and publish it.
\ No newline at end of file
+After that, a GitHub action will build the book and publish it.