diff --git a/templates/zerver/api/incoming-webhooks-walkthrough.md b/templates/zerver/api/incoming-webhooks-walkthrough.md
index 779f9d3c5e..0f657cb94c 100644
--- a/templates/zerver/api/incoming-webhooks-walkthrough.md
+++ b/templates/zerver/api/incoming-webhooks-walkthrough.md
@@ -269,7 +269,7 @@ Feel free to use 4-spaces as tabs for indentation if you'd like!
 
 Your sample notification may look like:
 
-<img class="screenshot" src="/static/images/api/helloworld-webhook.png" />
+<img class="screenshot" src="/static/images/api/helloworld-webhook.png" alt="screenshot" />
 
 
 
diff --git a/templates/zerver/api/update-message-flags.md b/templates/zerver/api/update-message-flags.md
index 9405012172..d68ed2a6ab 100644
--- a/templates/zerver/api/update-message-flags.md
+++ b/templates/zerver/api/update-message-flags.md
@@ -62,8 +62,10 @@ curl -X POST {{ api_url }}/v1/messages/flags \
 <div>
     <table>
         <thead>
-            <th style="width:30%">Flag</th>
-            <th style="width:70%">Purpose</th>
+            <tr>
+                <th style="width:30%">Flag</th>
+                <th style="width:70%">Purpose</th>
+            </tr>
         </thead>
         <tbody>
             <tr>
@@ -87,7 +89,7 @@ curl -X POST {{ api_url }}/v1/messages/flags \
                 <td>`mentioned`</td>
                 <td>
                      Whether the current user [was
-                     mentioned](/help/mention-a-user-or-group)</a> by
+                     mentioned](/help/mention-a-user-or-group) by
                      this message, either directly or via a user
                      group.  Not editable.
                 </td>