diff --git a/api.yaml b/api.yaml
index 8ae508e..46b9fda 100644
--- a/api.yaml
+++ b/api.yaml
@@ -288,7 +288,7 @@ components:
           nullable: true
         content:
           type: string
-          description: The article itself, formatted as markdown
+          description: The article itself, formatted as markdown. Must be encoded as base64
     ArticleSummary:
       type: object
       properties: