diff --git a/doc/source/configuration.rst b/doc/source/configuration.rst
index 1d02395058..fc0a620441 100644
--- a/doc/source/configuration.rst
+++ b/doc/source/configuration.rst
@@ -41,6 +41,7 @@ The defined phases are:
 -  **extra** - runs after services are started and before any files in
    ``extra.d`` are executed
 -  **post-extra** - runs after files in ``extra.d`` are executed
+-  **test-config** - runs after tempest (and plugins) are configured
 
 The file is processed strictly in sequence; meta-sections may be
 specified more than once but if any settings are duplicated the last to