diff --git a/doc/reference/source.md b/doc/reference/source.md
index 2efc8eb..20a4042 100644
--- a/doc/reference/source.md
+++ b/doc/reference/source.md
@@ -11,7 +11,7 @@ source:
     keyserver: <string>
     variant: <string>
     suite: <string>
-    same_as: <boolean>
+    same_as: <string>
     skip_verification: <boolean>
     components: <array>
 ```