diff --git a/README.md b/README.md
index d2e2b42..16c5099 100644
--- a/README.md
+++ b/README.md
@@ -15,4 +15,6 @@
 </a>
 </p>
 
-An open source scientific article created using the [showyourwork](https://github.com/showyourwork/showyourwork) workflow.
+*This is an automatically generated test for [showyourwork](https://github.com/showyourwork/showyourwork) generated from the file [test_variable.py](https://github.com/showyourwork/showyourwork/blob/main/tests/integration/test_variable.py).*
+
+Test a workflow with dynamic quantities imported into the tex file.
diff --git a/Snakefile b/Snakefile
index e69de29..cb10c3e 100644
--- a/Snakefile
+++ b/Snakefile
@@ -0,0 +1,8 @@
+
+
+
+rule age_of_universe:
+    output:
+        'src/tex/output/age_of_universe.txt'
+    script:
+        'src/scripts/age_of_universe.py'
diff --git a/src/scripts/age_of_universe.py b/src/scripts/age_of_universe.py
new file mode 100644
index 0000000..beb7f0e
--- /dev/null
+++ b/src/scripts/age_of_universe.py
@@ -0,0 +1,12 @@
+
+import paths
+import numpy as np
+
+# Compute the age of the universe
+np.random.seed(42)
+age = np.random.normal(14.0, 1.0)
+
+# Write it to disk
+with open(paths.output / "age_of_universe.txt", "w") as f:
+    f.write(f"{age:.3f}")
+
diff --git a/src/tex/ms.tex b/src/tex/ms.tex
index 6ab8e9c..09f486b 100644
--- a/src/tex/ms.tex
+++ b/src/tex/ms.tex
@@ -54,4 +54,6 @@ \section{Introduction}
 
 \bibliography{bib}
 
+Based on a detailed analysis of Planck observations of the cosmic microwave background, we have determined the age of the universe to be \variable{output/age_of_universe.txt} Gyr.
 \end{document}
+