diff --git a/2020/README.md b/2020/README.md
index 241d239..1df80fd 100644
--- a/2020/README.md
+++ b/2020/README.md
@@ -12,3 +12,5 @@ https://adventofcode.com/2020/
 | 4 |  `**`  |  `**`   |      |
 | 5 |        |  `**`   |      |
 | 6 |        |  `**`   |      |
+
+`test.sh` can be used to run all solutions and automatically compares them to (my) puzzle inputs and the expected outputs.