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diff --git a/README.md b/README.md
index d5e7280..b415daa 100644
--- a/README.md
+++ b/README.md
@@ -27,6 +27,7 @@ define a "public API". These aspects of Ceres together form the public API:
 - command line interface
 - HTTP interface
 - data storage format
+- configuration file format and structure
 
 As soon as version 1.0.0 is reached these aspects are stable.