diff --git a/express/content-types.ts b/express/content-types.ts
index 94cdbfc..eca7c72 100644
--- a/express/content-types.ts
+++ b/express/content-types.ts
@@ -2,8 +2,7 @@ import { Extensible } from "./interfaces";
 
 export type ContentType = string;
 
-// FIXME: Fill this out (get an AI to do it)
-
+// tx claude https://claude.ai/share/344fc7bd-5321-4763-af2f-b82275e9f865
 const contentTypes = {
     text: {
         plain: "text/plain",
@@ -11,6 +10,9 @@ const contentTypes = {
         css: "text/css",
         javascript: "text/javascript",
         xml: "text/xml",
+        csv: "text/csv",
+        markdown: "text/markdown",
+        calendar: "text/calendar",
     },
     image: {
         jpeg: "image/jpeg",
@@ -18,23 +20,103 @@ const contentTypes = {
         gif: "image/gif",
         svgPlusXml: "image/svg+xml",
         webp: "image/webp",
+        bmp: "image/bmp",
+        ico: "image/x-icon",
+        tiff: "image/tiff",
+        avif: "image/avif",
     },
     audio: {
         mpeg: "audio/mpeg",
         wav: "audio/wav",
+        ogg: "audio/ogg",
+        webm: "audio/webm",
+        aac: "audio/aac",
+        midi: "audio/midi",
+        opus: "audio/opus",
+        flac: "audio/flac",
     },
     video: {
         mp4: "video/mp4",
         webm: "video/webm",
         xMsvideo: "video/x-msvideo",
+        mpeg: "video/mpeg",
+        ogg: "video/ogg",
+        quicktime: "video/quicktime",
+        xMatroska: "video/x-matroska",
     },
     application: {
         json: "application/json",
         pdf: "application/pdf",
         zip: "application/zip",
-        xWwwFormUrlencoded: "x-www-form-urlencoded",
-        octetStream: "octet-stream",
+        xWwwFormUrlencoded: "application/x-www-form-urlencoded",
+        octetStream: "application/octet-stream",
+        xml: "application/xml",
+        gzip: "application/gzip",
+        javascript: "application/javascript",
+        ld_json: "application/ld+json",
+        msword: "application/msword",
+        vndOpenxmlformatsOfficedocumentWordprocessingmlDocument:
+            "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
+        vndMsExcel: "application/vnd.ms-excel",
+        vndOpenxmlformatsOfficedocumentSpreadsheetmlSheet:
+            "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
+        vndMsPowerpoint: "application/vnd.ms-powerpoint",
+        vndOpenxmlformatsOfficedocumentPresentationmlPresentation:
+            "application/vnd.openxmlformats-officedocument.presentationml.presentation",
+        sql: "application/sql",
+        graphql: "application/graphql",
+        wasm: "application/wasm",
+        xTar: "application/x-tar",
+        x7zCompressed: "application/x-7z-compressed",
+        xRarCompressed: "application/x-rar-compressed",
+    },
+    multipart: {
+        formData: "multipart/form-data",
+        byteranges: "multipart/byteranges",
+    },
+    font: {
+        woff: "font/woff",
+        woff2: "font/woff2",
+        ttf: "font/ttf",
+        otf: "font/otf",
     },
 };
 
 export { contentTypes };
+
+/*
+
+possible additions for later
+
+Looking at what's there, here are a few gaps that might be worth filling:
+Streaming/Modern Web:
+
+application/x-ndjson or application/jsonlines - newline-delimited JSON (popular for streaming APIs)
+text/event-stream - Server-Sent Events
+
+API/Data Exchange:
+
+application/yaml or text/yaml - YAML files
+application/protobuf - Protocol Buffers
+application/msgpack - MessagePack
+
+Archives you're missing:
+
+application/x-bzip2 - bzip2 compression
+
+Images:
+
+image/heic - HEIC/HEIF (common on iOS)
+
+Fonts:
+
+application/vnd.ms-fontobject - EOT fonts (legacy but still seen)
+
+Text:
+
+text/rtf - Rich Text Format
+
+The most impactful would probably be text/event-stream (if you do any SSE), application/x-ndjson (common in modern APIs), and maybe text/yaml. The rest are more situational.
+But honestly, what you have covers 95% of common web development scenarios. You can definitely add as you go when you encounter specific needs!
+
+*/