diff --git a/assignments/act3-describing-video-image.md b/assignments/act3-describing-video-image.md
index 768db280ea1435ed182d2b58c789236921d733fb..ac629a066f0b11bc37194a38c9c42d7648801634 100644
--- a/assignments/act3-describing-video-image.md
+++ b/assignments/act3-describing-video-image.md
@@ -7,14 +7,10 @@ code: ex1
 
 assigned: April 21, 2021
 due: 
-- <strong>Writeup</strong><BR>
-  April 26, 2021 in class</strong>
-- <strong>Presentation</strong><br>
-  in-class on April 26<br>
-- <strong>Peer evaluation</strong><br>
-  in-class<br>
+- <strong>Activity</strong><BR>
+  April 19, 2021 in class</strong>
   
-revised: March 10, 2021
+revised: April 5, 2021
 
 objective: Describe a video and image
 
@@ -27,9 +23,8 @@ objective: Describe a video and image
 # Assignment Description
 
 This activity requires you to:
-1. find an image, and describe it (write alt-text).
+1. Find an image, and describe it (write alt-text).
 2. Describe a video on [YouDescribe](https://youdescribe.org/). The website authors put together a [comprehensive set of instructions](https://youdescribe.org/support/tutorial) to use their interface to describe videos.
- 
 
 ## What counts as a good image
 
diff --git a/assignments/index.md b/assignments/index.md
index 680fe5031f46899ed522979e2f415b67f88e940c..7ccc771b9207959625c74e605d3ae44942c6b85e 100644
--- a/assignments/index.md
+++ b/assignments/index.md
@@ -20,7 +20,7 @@ questions or run into issue, please contact the course staff.
 | [Activity 1: Learning goals]({{site.baseurl}}/assignments/hw0-learninggoals.html)               |   |  |  
 | [HW0: AT around us]({{site.baseurl}}/assignments/act1-finding-accessibility.html)               |   |  |  
 | [HW1: Improve a screen reader]({{site.baseurl}}/assignments/hw1-nvda.html)               |   |  | 
-| Activity2: Make a website usable with switch access -- spec coming soon.               |   |  |
+| In Class Activity: Using switch access on your phone                |   |  |
 | [Activity3: Describe pictures and videos]({{site.baseurl}}/assignments/act3-describing-video-image.html)               |   |  |
 | [HW2: teach machines to recognize sounds and visualize them]({{site.baseurl}}/assignments/hw2-soundRecognition.html) -- spec coming soon, timeline updated.               |   |  |
 | [Final project: Make the World more accessible]({{site.baseurl}}/assignments/project.html)               |   |  |
diff --git a/schedule.md b/schedule.md
index 7f21d5dcf33c75677d7c0c40c1258856ef34a1a8..717da3d33fe01c2e658bfd397a67a57f3271606c 100644
--- a/schedule.md
+++ b/schedule.md
@@ -64,17 +64,20 @@ You will need to submit the [learning goals homework](assignments/hw0-learninggo
 # Week 4 (4/19): Accessible Media 
 We will learn about best practices to make certain types of media accessible.
   - Intro to alt-text and audio description.
-  - Describe a video.
+  - Describe a video (in class) and an image (in class)
   - Intro to captions.
 
 **Readings**
-- [What is audio description?](https://www.acb.org/adp/ad.html)
-- [Rescribe: Authoring and Automatically Editing Audio Descriptions](https://amypavel.com/papers/rescribe.pdf) ([talk](https://www.youtube.com/watch?v=jmyPmT5T0PY))
-
-{: .lecture} TBD lecture on intro to audio descriptions, captions and alt-text.
-: **Slides**
-TBD
-
+- [Rescribe: Authoring and Automatically Editing Audio Descriptions](https://amypavel.com/papers/rescribe.pdf) ([talk](https://www.youtube.com/watch?v=jmyPmT5T0PY)) 
+- [Alt text intro](https://webaim.org/techniques/alttext/) (and find an image with alt text on the web) Was it hard to find? Where did you have to go?
+- Optional: [What is audio description?](https://www.acb.org/adp/ad.html)
+
+{: .lecture} Discussion & in-class activity.
+: **Learning Goals**
+- Understanding how to write good alt text
+- Differences between image description and UI description
+- Understanding video description
+- Awareness of where and why alt text is missing on the web
 
 {: .lecture} Homework 1 final presentations.
 : **Slides** to be uploaded by students on canvas