diff --git a/changelog/6856.feature.rst b/changelog/6856.feature.rst
index e69de29bb..36892fa21 100644
--- a/changelog/6856.feature.rst
+++ b/changelog/6856.feature.rst
@@ -0,0 +1,3 @@
+A warning is now shown when an unknown key is read from a config INI file.
+
+The `--strict-config` flag has been added to treat these warnings as errors.