diff --git a/README.md b/README.md
index 57cdc8a4..a7cd5117 100644
--- a/README.md
+++ b/README.md
@@ -82,6 +82,8 @@ cargo update -p proc-macro2 --precise 1.0.63
 cargo update -p serde_test --precise 1.0.175
 ```
 
+The above commands are sourced from `./contrib/test.sh`.
+
 ## External dependencies
 
 We integrate with a few external libraries, most notably `serde`. These