Inserting appropriately-sized figure

_episodes/02-formatting.md

@@ -24,6 +24,11 @@ each of which has:
 *   some teachable content
 *   some exercises
 
+The diagram below shows the internal structure of a single episode file
+(click on the image to see a larger version):
+
+<a href="{{ site.root }}/fig/episode-format.png"><img src="{{ site.root }}/fig/episode-format-small.png" alt="Formatting Rules" /></a>
+
 ## Locations and Names
 
 Episode files are stored in `_episodes` so that [Jekyll][jekyll] will create a [collection][jekyll-collection] for them.

_episodes/03-organization.md

@@ -20,9 +20,10 @@ We could load these from the web,
 but that would make offline authoring difficult.
 Instead, each lesson's repository is self-contained.
 
-![Source and Destination Files]({{ site.root }}/fig/file-mapping.svg)
+The diagram below shows how source files and directories are laid out,
+and how they are mapped to destination files and directories:
 
-![Formatting Rules]({{ site.root }}/fig/episode-format.png)
+![Source and Destination Files]({{ site.root }}/fig/file-mapping.svg)
 
 > ## Collections
 >