diff --git a/course-definition.yml b/course-definition.yml
index 7a5e93f..909caff 100644
--- a/course-definition.yml
+++ b/course-definition.yml
@@ -150,6 +150,8 @@ stages:
         "go-tcp-server",
         "rust-tcp-server",
         "python-tcp-server",
+        "java-tcp-server",
+        "cpp-tcp-server",
       ]
     # The name of the stage. This is shown in the course catalog, and on other
     # course pages.
@@ -181,6 +183,8 @@ stages:
         "go-tcp-server",
         "rust-tcp-server",
         "python-tcp-server",
+        "java-tcp-server",
+        "cpp-tcp-server",
       ]
     name: "Respond with 200"
     difficulty: very_easy
@@ -188,6 +192,16 @@ stages:
       In this stage, you'll extend your TCP server to respond to a HTTP request with a 200 response.
 
   - slug: "ih0"
+    concept_slugs:
+      [
+        "network-protocols",
+        "tcp-overview",
+        "go-tcp-server",
+        "rust-tcp-server",
+        "python-tcp-server",
+        "java-tcp-server",
+        "cpp-tcp-server",
+      ]
     name: "Extract URL path"
     difficulty: easy
     marketing_md: |-
@@ -213,6 +227,8 @@ stages:
         "go-tcp-server",
         "rust-tcp-server",
         "python-tcp-server",
+        "java-tcp-server",
+        "cpp-tcp-server",
       ]
     name: "Concurrent connections"
     difficulty: easy