Update README.md

Author: FloopCZ

README.md

@@ -69,8 +69,10 @@ sudo pacman -S cuda cudnn nvidia
 **Warning:** Newer versions of TensorFlow sometimes fail to build with the latest version of Bazel. You may wish
 to install an older version of Bazel (e.g., 5.1.1).
 
-**Warning:** If your program uses Protobuf and you encounter linkage problems, you can try `-DINSTALL_PROTOBUF=ON` option
-to install a Protobuf version matching the version bundled with TensorFlow.
+**Warning:** If your program uses Protobuf and you encounter linkage or other problems, you can
+try `-DINSTALL_PROTOBUF=ON` option to install a Protobuf version matching the version bundled with TensorFlow.
+Our Dockerfiles are already built with the right version of Protobuf, so you may want to try
+your program in the Dockerfile first.
 
 #### 2) Clone this repository
 ```