diff --git a/17.md b/17.md
index 3ccdc772..6e44b0d8 100644
--- a/17.md
+++ b/17.md
@@ -80,6 +80,7 @@ Kind `15` is used for sending encrypted file event messages:
 - `ox` containing the SHA-256 hexencoded string of the file before encryption.
 - `size` (optional) size of the encrypted file in bytes
 - `dim` (optional) size in pixels in the form `<width>x<height>`
+- `thumbhash`(optional) the [thumbhash](https://evanw.github.io/thumbhash/) to show while the client is loading the file
 - `blurhash`(optional) the [blurhash](https://github.com/woltapp/blurhash) to show while the client is loading the file
 - `thumb` (optional) URL of thumbnail with same aspect ratio (encrypted with the same key, nonce)
 - `fallback` (optional) zero or more fallback file sources in case `url` fails (encrypted with the same key, nonce)
diff --git a/68.md b/68.md
index 918378a9..89b95894 100644
--- a/68.md
+++ b/68.md
@@ -31,6 +31,7 @@ They may contain multiple images to be displayed as a single post.
       "imeta",
       "url https://nostr.build/i/my-image.jpg",
       "m image/jpeg",
+      "thumbhash zOcFFIIKmXdCinaXaHcmcHUFSA==",
       "blurhash eVF$^OI:${M{o#*0-nNFxakD-?xVM}WEWB%iNKxvR-oetmo#R-aen$",
       "dim 3024x4032",
       "alt A scenic photo overlooking the coast of Costa Rica",
@@ -42,7 +43,7 @@ They may contain multiple images to be displayed as a single post.
       "imeta",
       "url https://nostr.build/i/my-image2.jpg",
       "m image/jpeg",
-      "blurhash eVF$^OI:${M{o#*0-nNFxakD-?xVM}WEWB%iNKxvR-oetmo#R-aen$",
+      "thumbhash zOcFFIIKmXgzmWaXWIcmcFQEGA",
       "dim 3024x4032",
       "alt Another scenic photo overlooking the coast of Costa Rica",
       "x <sha256 hash as specified in NIP 94>",