diff --git a/src/helpers/related_projects.js b/src/helpers/related_projects.js
index fff7579..743ebd2 100644
--- a/src/helpers/related_projects.js
+++ b/src/helpers/related_projects.js
@@ -235,9 +235,19 @@ function relatedProjects (categories = [], projectIds = []) {
     { href: 'https://docs.spring.io/spring-ai/reference/', id: 'ai', text: 'Spring AI' },
     { href: 'https://docs.spring.io/spring-cli/reference/', id: 'cli', text: 'Spring CLI' },
     { href: 'https://docs.spring.io/spring-graphql/reference/', id: 'graphql', text: 'Spring GraphQL' },
-    { href: 'https://docs.spring.io/spring-kafka/reference/', id: 'kafka', text: 'Spring for Apache Kafka' },
+    {
+      href: 'https://docs.spring.io/spring-kafka/reference/',
+      id: 'kafka',
+      text: 'Spring for Apache Kafka',
+      categories: ['messaging'],
+    },
     { href: 'https://docs.spring.io/spring-modulith/reference/', id: 'modulith', text: 'Spring Modulith' },
-    { href: 'https://docs.spring.io/spring-pulsar/reference/', id: 'pulsar', text: 'Spring Pulsar' },
+    {
+      href: 'https://docs.spring.io/spring-pulsar/reference/',
+      id: 'pulsar',
+      text: 'Spring for Apache Pulsar',
+      categories: ['messaging'],
+    },
     { href: 'https://docs.spring.io/spring-shell/reference/', id: 'shell', text: 'Spring Shell' },
   ]
   return projectDocumentation.filter(