Merge pull request #404 from twitter/jbaxter/2026_02_04_data_update

Update download-data.md with new collaborative notes columns

Author: jbaxter

documentation/under-the-hood/download-data.md

@@ -42,6 +42,14 @@ Each data snapshot table is stored in tsv (tab-separated values) file format wit
 As we iterate and improve Community Notes, we will occasionally make changes to the questions we ask contributors in the note writing and note rating forms, or additional metadata shared about notes and rating. When we do this, some question fields / columns in our public data will be deprecated (no longer populated), and others will be added. Below we will keep a change log of changes we have made to the contribution form questions and other updates we have made to the data, as well as when those changes were made.
 
 {% accordionSection %}
+
+{% accordionItem title="2026-02-04 - New columns for Collaborative Notes"  %}
+
+- We’ve updated the open-source notes dataset to add a new boolean, `isCollaborativeNote`, to indicate whether the note is a collaborative or regular note.
+- We've also added a new `suggestion` string field to the open-source ratings dataset, which contains user-entered text suggestions (on collaborative notes).
+
+{% /accordionItem %}
+
 {% accordionItem title="2026-01-12 - Updated Note Request dataset"  %}
 
 - We’ve updated the open-source note request dataset to include posts that either had note requests [showing in-app](./note-requests.md), or were made available via the [AI Note Writer API](../api/overview.md).
@@ -143,6 +151,7 @@ As we iterate and improve Community Notes, we will occasionally make changes to
 | `trustworthySources` | Int | Binary indicator, based on user-entered multiple choice in response to note writing question “Did you link to sources you believe most people would consider trustworthy?” | 1 if “Yes” is selected, 0 if “No” is selected |
 | `summary` | String | User-entered text, in response to the note writing prompt “Please explain the evidence behind your choices, to help others who see this tweet understand why it is not misleading” | User entered text explanation, with some characters escaped (e.g. tabs converted to spaces). |
 | `isMediaNote` | Int | User-entered checkbox in response to question “Is your note about the Tweet or the image?”. _New as of 2023-05-24_. | 1 if “About the image in this Tweet, and should appear on all Tweets that include this image” is selected, and 0 otherwise (including both if "About this specific Tweet" is selected instead, or by default, e.g. if the note was written on a Tweet without media). |
+| `isCollaborativeNote` | Int | Binary indicator indicating if the note is a collaborative note. _New as of 2026-02-04_ | 1 if the note is a collaborative note. 0 if the note is a regular note (default).
 
 ### Note Status History
 
@@ -211,6 +220,7 @@ As we iterate and improve Community Notes, we will occasionally make changes to
 | `notHelpfulNoteNotNeeded`                | Int    | User-entered checkbox in response to prompt “What was unhelpful about it?” (Check all that apply question type). New as of 2021-12-15                                                                               | 1 if “Note not needed on this Tweet” is selected, else 0.        |
 | `ratedOnTweetId`                         | Long   | The unique ID of the Tweet that the note was rated on (which, in the case of media notes, may not be the same Tweet as the note was originally written on). _New as of 2023-05-24_.                                 |
 | `ratingSourceBucketed`                         | String   | The source of the rating (ratings are population-sampled only if they are made in response to a "Needs Your Help" notification).  _New as of 2025-09-30_.                                 | "DEFAULT", "POPULATION_SAMPLED"
+| `suggestion`                         | String   | User-entered suggestion string (for collaborative notes).  _New as of 2026-02-04_.                                 | 
 
 ### User Enrollment