Update README.md

README.md

@@ -224,6 +224,12 @@ Another limitation is that the more preferred response in SHP is not necessarily
 Though some comments do provide citations to justify their response, most do not.
 There are exceptions to this, such as the `askhistorians` subreddit, which is heavily moderated and answers are expected to provide citations.
 
+Note that the collective preference label in SHP is not necessarily what we would get if we asked users to independently vote on each comment before taking an unweighted sum.
+This is because comment scores on Reddit are public and are known to influence user preferences; a high score increases the likelihood of getting more positive votes [(Muchnik et al., 2013)](https://pubmed.ncbi.nlm.nih.gov/23929980/).
+Whether this "herding effect" temporarily or permanently shifts a user's preference is unclear.
+Therefore, while SHP does reflect collective human preferences, models trained on SHP may not generalize to settings where individual preferences are aggregated differently (e.g., users vote independently without ever seeing the current comment score, users vote after conferring, etc.).
+Thanks to Greg Stoddard for pointing this out.
+
 
 ## Contact