diff --git a/README.md b/README.md
index a78ad50..2b722a2 100644
--- a/README.md
+++ b/README.md
@@ -13,20 +13,25 @@ See the [rendered book](https://lborb.github.io/book/).
 ## Development
 
 Install [`mdbook`](https://github.com/rust-lang/mdBook):
-```
+
+```console
 cargo install mdbook
 ```
 
 Build the book:
-```
+
+```console
 mdbook build
 ```
+
 The generated files are in the `book` directory.
 
 View the built book:
-```
+
+```console
 mdbook serve
 ```
+
 This will launch a local web server to serve the book. Navigate to
 [localhost:3000](http://localhost:3000/) in a web browser. While the web server
 is running, the rendered book will automatically update if the source files
@@ -35,10 +40,17 @@ change.
 ### Conventions
 
 Each entry is of the form:
-```
+
+```markdown
 * [The Literal Title of The Book](https://a-link-to-the/book/) - an optional comment if the title isn't self-explanatory
 ```
 
+Entries for items in formats other than mdbook are italicised, like this:
+
+```markdown
+* [_The Literal Title of The Item_](https://a-link-to-the/book/) - an optional comment if the title isn't self-explanatory
+```
+
 The `.editorconfig` file captures basic source files formatting conventions.
 Many editors support this file natively; others (such as VS code) require a plugin, see https://editorconfig.org/.