diff --git a/templates/zerver/api/changelog.md b/templates/zerver/api/changelog.md
index 8ec4b86c0b..fd7b75a830 100644
--- a/templates/zerver/api/changelog.md
+++ b/templates/zerver/api/changelog.md
@@ -10,6 +10,13 @@ below features are supported.
 
 ## Changes in Zulip 4.0
 
+**Feature level 33**
+
+* Markdown code blocks now have a `data-code-language` attribute
+  attached to the outer `div` element, recording the programming
+  language that was selecting for syntax highlighting.  This field
+  supports the upcoming "view in playground" feature for code blocks.
+
 **Feature level 32**
 
 * [`GET /events`](/api/get-events): Added `op` field to
diff --git a/version.py b/version.py
index 9a1f7cfeb1..5bad098dda 100644
--- a/version.py
+++ b/version.py
@@ -29,7 +29,7 @@ DESKTOP_WARNING_VERSION = "5.2.0"
 #
 # Changes should be accompanied by documentation explaining what the
 # new level means in templates/zerver/api/changelog.md.
-API_FEATURE_LEVEL = 32
+API_FEATURE_LEVEL = 33
 
 # Bump the minor PROVISION_VERSION to indicate that folks should provision
 # only when going from an old version of the code to a newer version. Bump