diff --git a/Steepfile b/Steepfile
new file mode 100644
index 0000000..edee931
--- /dev/null
+++ b/Steepfile
@@ -0,0 +1,8 @@
+D = Steep::Diagnostic
+
+target :lib do
+  signature "sig"
+  check "lib" # Directory name to check
+
+  configure_code_diagnostics(D::Ruby.silent) # `silent` diagnostics setting
+end