diff --git a/content/video-editing.rst b/content/video-editing.rst
index ed5b4f9..869a34b 100644
--- a/content/video-editing.rst
+++ b/content/video-editing.rst
@@ -96,7 +96,7 @@ These exercises will take you through the whole sequence.
 
       .. code-block::
 
-	 whisper --device cuda --output_format srt --initial_prompt="Welcome to CodeRefinery day four." --lang en --condition_on_previous_text False INPUT.mkv
+         whisper --device cuda --output_format srt --initial_prompt="Welcome to CodeRefinery day four." --lang en --condition_on_previous_text False INPUT.mkv
 
       An initial prompt like this make Whisper more likely to output
       full sentences, instead of a stream of words with no
@@ -124,14 +124,14 @@ These exercises will take you through the whole sequence.
 
       # This is the output from one section.  Your result should have two of these sections.
       - output: part1.mkv
-	title: something
-	description: >-
-	  some long
-	  description of the
-	  segment
-	editlist:
-	  - start: 10:00    # start timestamp of the section, in *original* video
-	  - end: 20:00      # end timestamp of the section, in the *original* video
+        title: something
+        description: >-
+          some long
+          description of the
+          segment
+        editlist:
+          - start: 10:00    # start timestamp of the section, in *original* video
+          - end: 20:00      # end timestamp of the section, in the *original* video
 
    .. solution::
 
@@ -140,33 +140,33 @@ These exercises will take you through the whole sequence.
 
       .. code-block:: yaml
 
-	 - input: day1-obs.mkv
+         - input: day1-obs.mkv
 
-	 - output: day1-intro.mkv
-	   title: 1.2 Introduction
-	   description: >-
-	     General introduction to the workshop.
+         - output: day1-intro.mkv
+           title: 1.2 Introduction
+           description: >-
+             General introduction to the workshop.
 
-	     https://scicomp.aalto.fi/training/kickstart/intro/
+             https://scicomp.aalto.fi/training/kickstart/intro/
 
-	   editlist:
-	   - start: 00:24:10
-	   - end: 00:37:31
+           editlist:
+           - start: 00:24:10
+           - end: 00:37:31
 
 
-	 - output: day1-from-data-storage-to-your-science.mkv
-	   title: "1.3 From data storage to your science"
-	   description: >-
-	     Data is how most computational work starts, whether it is
-	     externally collected, simulation code, or generated. And these
-	     days, you can work on data even remotely, and these workflows
-	     aren't obvious. We discuss how data storage choices lead to
-	     computational workflows.
+         - output: day1-from-data-storage-to-your-science.mkv
+           title: "1.3 From data storage to your science"
+           description: >-
+             Data is how most computational work starts, whether it is
+             externally collected, simulation code, or generated. And these
+             days, you can work on data even remotely, and these workflows
+             aren't obvious. We discuss how data storage choices lead to
+             computational workflows.
 
-	     https://hackmd.io/@AaltoSciComp/SciCompIntro
+             https://hackmd.io/@AaltoSciComp/SciCompIntro
 
-	   editlist:
-	   - start: 00:37:43
+           editlist:
+           - start: 00:37:43
            - end: 00:50:05
 
 
@@ -206,7 +206,7 @@ These exercises will take you through the whole sequence.
 
       .. code-block:: console
 
-	$ ffmpeg-editlist editlist.yaml .
+        $ ffmpeg-editlist editlist.yaml .
 
       Just running like this is quick and works, but the stream may be
       garbled in the first few seconds (because it's missing a key
@@ -246,13 +246,13 @@ These exercises will take you through the whole sequence.
    .. solution::
 
       * This course actually didn't have chapters for the first day
-	sessions, but you can `see chapters for day 2 here
-	<https://github.com/AaltoSciComp/video-editlists-asc/blob/master/kickstart-2023.yaml#L239-L262>`__,
-	for example.
+        sessions, but you can `see chapters for day 2 here
+        <https://github.com/AaltoSciComp/video-editlists-asc/blob/master/kickstart-2023.yaml#L239-L262>`__,
+        for example.
       * `Example of the workshop description for this course
-	<https://github.com/AaltoSciComp/video-editlists-asc/blob/master/kickstart-2023.yaml#L1-L13>`__
+        <https://github.com/AaltoSciComp/video-editlists-asc/blob/master/kickstart-2023.yaml#L1-L13>`__
       * Example info.txt file for the general introduction to the
-	course.  The part after the ``-----`` is the workshop description.
+        course.  The part after the ``-----`` is the workshop description.
 
         .. code-block::
 
@@ -262,6 +262,10 @@ These exercises will take you through the whole sequence.
 
             https://scicomp.aalto.fi/training/kickstart/intro/
 
+            00:00 Begin introduction       <-- Invented for the exercise demo, not real
+            03:25 Ways to attend           <-- Invented for the exercise demo, not real
+            07:12 What if you get lost     <-- Invented for the exercise demo, not real
+
             -----
 
             This is part of the Aalto Scientific Computing "Getting
@@ -369,11 +373,11 @@ video.
 
       - input: sample-video-to-edit.raw.mkv
       - output: sample-video-to-edit.processed.mkv
-	description: >
+        description: >
         editlist:
           - start: 00:16
-	  - 00:15: demonstration
-	  - 00:20: discussion
+          - 00:15: demonstration
+          - 00:20: discussion
           - stop: 00:25
 
    .. code:: console