diff --git a/ipa/general/0100.md b/ipa/general/0100.mdx
similarity index 69%
rename from ipa/general/0100.md
rename to ipa/general/0100.mdx
index 0ac5c89..f94d0f7 100644
--- a/ipa/general/0100.md
+++ b/ipa/general/0100.mdx
@@ -12,6 +12,10 @@ language.
 
 ## Guidance
 
+<Guidelines>
+
+<Guideline id="IPA-0100-must-use-american-english" given="spec" lintable>
+
 API producers **must** use American English across the API.
 
 This includes but is not limited to:
@@ -21,13 +25,35 @@ This includes but is not limited to:
 - Descriptions
 - Enum values
 
-**Example:** “canceled” over
-[cancelled](https://www.mongodb.com/docs/atlas/reference/api-resources-spec/v2/#tag/Cloud-Backups/operation/createBackupExportJob).
+:::note
 
 The MongoDB Style Guide uses the Merriam-Webster’s Collegiate Dictionary. 11th
 ed. Springfield, MA: Merriam-Webster, 2003. Continually updated at
 [https://www.merriam-webster.com/](https://www.merriam-webster.com/).
 
+:::
+
+<Example.Correct>
+
+```yaml
+properties:
+  status:
+    type: string
+    enum:
+      - CANCELED
+      - COMPLETED
+```
+
+<Example.Reason>
+  Uses the American English spelling "canceled" (one "l") in the enum value.
+</Example.Reason>
+
+</Example.Correct>
+
+</Guideline>
+
+</Guidelines>
+
 ## Further Reading
 
 [MongoDB Meta Documentation](https://www.mongodb.com/docs/meta/style-guide/terminology/general-term-guidelines/use-consistent-terms/#use-consistent-terminology)
diff --git a/src/components/ipa/Guideline/index.tsx b/src/components/ipa/Guideline/index.tsx
index 6de7733..5b94513 100644
--- a/src/components/ipa/Guideline/index.tsx
+++ b/src/components/ipa/Guideline/index.tsx
@@ -28,7 +28,11 @@ export function Guideline({
         {isInsideGuidelines && <NumberCircle />}
         <div className={styles.content}>
           <GuidelineHeader />
-          <div className={styles.body}>{children}</div>
+          {/* `markdown` makes children inherit Docusaurus' markdown vertical
+              rhythm (heading/paragraph/list/admonition spacing), since the
+              `.markdown > *` rules only match direct children of a markdown
+              container. */}
+          <div className={clsx(styles.body, "markdown")}>{children}</div>
           <GuidelineFooter />
         </div>
       </Root>