diff --git a/doc/configuration.rst b/doc/configuration.rst
index bd1031a7..2ed89342 100644
--- a/doc/configuration.rst
+++ b/doc/configuration.rst
@@ -21,6 +21,7 @@ Minimal Config Example
     # GENERAL SETTINGS
     comps_file = "comps-f23.xml"
     variants_file = "variants-f23.xml"
+    module_defaults_dir = "module_defaults"
 
     # KOJI
     koji_profile = "koji"
@@ -135,6 +136,10 @@ Options
     (:ref:`scm_dict <scm_support>` or *str*) -- reference to variants XML file
     that defines release variants and architectures
 
+**module_defaults_dir** [optional]
+    (:ref:`scm_dict <scm_support>` or *str*) -- reference the module defaults
+    directory containing modulemd-defaults YAML documents
+
 **failable_deliverables** [optional]
     (*list*) -- list which deliverables on which variant and architecture can
     fail and not abort the whole compose. This only applies to ``buildinstall``