diff --git a/_episodes/02-formatting.md b/_episodes/02-formatting.md
index 843a6d61fe2b5f813381d044a2c14835e3e5a4cd..4d895acbdd9d152cc1273110096f11d358a2ac05 100644
--- a/_episodes/02-formatting.md
+++ b/_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.
diff --git a/_episodes/03-organization.md b/_episodes/03-organization.md
index 1972754c16f159b445405590bfc14bf01a769a50..93483fdbef5a29325cce1a3a3d917085451d4dc2 100644
--- a/_episodes/03-organization.md
+++ b/_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
 >
diff --git a/fig/SWC_episode_format_small.png b/fig/episode-format-small.png
similarity index 100%
rename from fig/SWC_episode_format_small.png
rename to fig/episode-format-small.png