diff --git a/README.md b/README.md
index 235bbe5..ca77f95 100644
--- a/README.md
+++ b/README.md
@@ -45,7 +45,7 @@ CRAN Debian server. Therefore we do not need to worry about system requirements:
 if the package can be built on CRAN, it can also build in the rcheckserver containers.
 
 
-## How to use in local R
+## How to run locally
 
 This will check your package and reverse dependencies from CRAN in your local R:
 
@@ -53,9 +53,18 @@ This will check your package and reverse dependencies from CRAN in your local R:
 recheck::recheck("mypackage_1.0.tar.gz")
 ```
 
-To run this on GitHub actions use:
+Alternatively to run it in the Ubuntu container, you need to mount a local source package in the container and then pass the path as an argument. For example:
 
+```sh
+# Download some example file:
+# curl -OL "https://ropensci.r-universe.dev/src/contrib/qpdf_1.3.3.tar.gz"
+docker run -it -v "qpdf_1.3.3.tar.gz:/qpdf_1.3.3.tar.gz" ghcr.io/r-universe-org/recheck "/qpdf_1.3.3.tar.gz"
 ```
 
+Or you can pass a URL to a public source package:
+
+```sh
+docker run -it ghcr.io/r-universe-org/recheck "https://ropensci.r-universe.dev/src/contrib/qpdf_1.3.3.tar.gz"
 ```
 
+## How to run on GitHub Actions