diff --git a/ChangeLog.rst b/ChangeLog.rst
index 73d4baf..5ecef67 100644
--- a/ChangeLog.rst
+++ b/ChangeLog.rst
@@ -2,6 +2,11 @@
  ChangeLog
 ===========
 
+0.2.0 (2018-06-04)
+==================
+
+System now explicitly requires ASDF >= 3.1.
+
 0.1.0 (2018-06-03)
 ==================
 
diff --git a/cl-info.asd b/cl-info.asd
index d39f14e..7ae21a4 100644
--- a/cl-info.asd
+++ b/cl-info.asd
@@ -1,3 +1,4 @@
+#-asdf3.1 (error "cl-info requires ASDF 3.1")
 (defsystem cl-info
   :version (:read-file-form "version.lisp-expr")
   :author ""