diff --git a/README.md b/README.md
index ad590ae119ea66ab72fb0b76436d0ed036d2d615..58b88bd9566e50d7f8329ef67fdbc2e9f16d2bc5 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,7 @@ This tool generates relationship information between satellites for the latency
    pip install sds-sat-latency --index-url https://gitlab.ssec.wisc.edu/api/v4/projects/2693/packages/pypi/simple
 
    ```
+   I add a pre-build environment py39env.zip in the gitlab repo
 ## Usage
 
 ### Generating Satellite Relationships