diff --git a/mediapipe/pose_tracking_dll/README.md b/mediapipe/pose_tracking_dll/README.md
index 6e4f483c7..fb4b731ac 100644
--- a/mediapipe/pose_tracking_dll/README.md
+++ b/mediapipe/pose_tracking_dll/README.md
@@ -9,14 +9,17 @@ Currently, the following features are supported:
 ## Prerequisites
 Follow the guidelines on the official Mediapipe website: https://google.github.io/mediapipe/getting_started/install.html#installing-on-windows
 
-IMPORTANT: The tutorial does not specify which version of Bazel to install. Install Bazel version 3.7.2
+IMPORTANT: The tutorial does not specify which version of Bazel to install. Install Bazel version 3.7.2. The OpenCV version used by default in mediapipe is 3.4.10.
+
+If you are using a different OpenCV version, adapt the `OPENCV_VERSION` variable in the file `mediapipe/external/opencv_<platform>.BUILD` to the one installed in the system (https://github.com/google/mediapipe/issues/1926#issuecomment-825874197).
+
 
 ## How to build
 Assuming you're in the root of the repository:
 
 ```
 cd mediapipe
-bazel build -c opt --define MEDIAPIPE_DISABLE_GPU=1 pose_tracking_dll:pose_tracking_cpu
+bazel build -c opt --define MEDIAPIPE_DISABLE_GPU=1 --action_env PYTHON_BIN_PATH=<path to the python executable described using forward slashes ("/")> pose_tracking_dll:pose_tracking_cpu
 ```
 
 Alternatively `dbg` can be used in place of `opt` to build the library with debug symbols in Visual Studio pdb format.