CONTRIBUTING: include instructions for installing protobuf

CONTRIBUTING.md

@@ -100,7 +100,25 @@ specify exactly the dependency you want to update, eg.
 
 ## Protobuf
 
-When working with [protobuf](https://developers.google.com/protocol-buffers) there are a few things you should know. We use [buf](https://buf.build/) for our linting and breaking changes checking. If you would like to run linting and check if the changes you have made are breaking then you will have to install the needed dependencies with `make buf`. Then the linting cmd will be `make proto-lint` and the breaking changes check will be `make proto-check-breaking`. To generate new stubs based off of your changes you can run `make proto-gen` (you can do this outside of GOPATH).
+We use [Protocol Buffers](https://developers.google.com/protocol-buffers) along with [gogoproto](https://github.com/gogo/protobuf) to generate code for use across Tendermint Core.
+
+For linting and checking breaking changes, we use [buf](https://buf.build/). If you would like to run linting and check if the changes you have made are breaking then you will have to install the needed dependencies with `make buf`. Then the linting cmd will be `make proto-lint` and the breaking changes check will be `make proto-check-breaking`.
+
+To generate new stubs based off of your changes you can run `make proto-gen` after installing `protoc` and gogoproto.
+
+### Installation Instructions
+
+To install `protoc`, download an appropriate release (https://github.com/protocolbuffers/protobuf) and then move the provided binaries into your PATH (follow instructions in README included with the download).
+
+To install `gogoproto`, do the following:
+
+```sh
+$ go get github.com/gogo/protobuf/gogoproto
+$ cd $GOPATH/pkg/mod/github.com/gogo/protobuf@v1.3.1 # or wherever go get installs things
+$ make install
+```
+
+You should now be able to run `make proto-gen` from inside the root Tendermint directory to generate new files from proto files.
 
 ## Vagrant