diff --git a/docs/ref-supported.md b/docs/ref-supported.md
index 3e374b7fe..4b26ec42c 100644
--- a/docs/ref-supported.md
+++ b/docs/ref-supported.md
@@ -17,6 +17,7 @@ CMOD | Customer enhancement projects | [#151](https://github.com/larshp/abapGit/
 CMPT | Code Composer Template | Yes
 DCLS | ABAP Data Control Language Sources | Yes
 DDLS | Data Definition Language Source | Yes
+DDLX | CDS metadata extension | Yes
 DEVC | Package | Yes
 DIAL | Dialog Module | Yes
 DOCT | General Text | Yes