diff --git a/src/content/posts/yearning-for-the-open-protocols/slides/slide-21.alt.txt b/src/content/posts/yearning-for-the-open-protocols/slides/slide-21.alt.txt
index 30404ce..fc4397f 100644
--- a/src/content/posts/yearning-for-the-open-protocols/slides/slide-21.alt.txt
+++ b/src/content/posts/yearning-for-the-open-protocols/slides/slide-21.alt.txt
@@ -1 +1 @@
-TODO
\ No newline at end of file
+Incomplete alt text: This slide is titled “A Simplified View of ATProto”. It is a busy diagram of how data goes from users, through the system (like relays and PDS’s), then to other users.