diff --git a/entrypoint.sh b/entrypoint.sh
index e69de29..9745fcc 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -0,0 +1,5 @@
+#!/bin/bash
+
+# Check if the required environment variable(s) is/are set
+: ${ENV_1}:?"Environment variable ENV_1 is required."
+