diff --git a/website/common/streamfield.py b/website/common/streamfield.py
index 7f6f018..e348196 100644
--- a/website/common/streamfield.py
+++ b/website/common/streamfield.py
@@ -63,6 +63,8 @@ IGNORE_PLAINTEXT_BLOCKS = (
     EmbedBlock,
     ImageCaptionBlock,
     CodeBlock,
+    MermaidBlock,
+    IFrameBlock,
 )
 IGNORE_HEADING_BLOCKS = (*IGNORE_PLAINTEXT_BLOCKS, LoremBlock)