diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index b99c5ca7..e1ac3e70 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -49,9 +49,10 @@ go get -u github.com/golang/protobuf/protoc-gen-go
 go install github.com/golang/protobuf/protoc-gen-go
 export GOBIN=$GOPATH/bin
 export PATH=$PATH:$GOBIN
-export SRC_DIR=$GOPATH/src/github.com/rqlite/rqlite/command
 export DEST_DIR=$GOPATH/src
-protoc -I=$SRC_DIR --go_out=$DEST_DIR $SRC_DIR/command.proto
+
+SRC_DIR=$GOPATH/src/github.com/rqlite/rqlite/command protoc -I=$SRC_DIR --go_out=$DEST_DIR $SRC_DIR/command.proto
+SRC_DIR=$GOPATH/src/github.com/rqlite/rqlite/cluster protoc -I=$SRC_DIR --go_out=$DEST_DIR $SRC_DIR/message.proto
 ```
 
 ### Speeding up the build process