diff --git a/index.html b/index.html
index 2090ad4..da01421 100644
--- a/index.html
+++ b/index.html
@@ -679,6 +679,15 @@ <h3>Options</h3>
 properties.
       </p>
     </section>
+    <section>
+      <h3>HTTP Headers</h3>
+      <p>
+All requests and responses sent to/from the VC API MUST contain the following header:
+      </p>      
+      <p>
+`Content-Type: application/json`</p>
+      </p>
+    </section>
 
     <section>
       <h3>Issuing</h3>