diff --git a/01.courses/01.optics/03.the-nature-of-light/01.textbook/frontmatter.yaml b/01.courses/01.optics/03.the-nature-of-light/01.textbook/frontmatter.yaml
index d4df9eb1f..a664ce410 100644
--- a/01.courses/01.optics/03.the-nature-of-light/01.textbook/frontmatter.yaml
+++ b/01.courses/01.optics/03.the-nature-of-light/01.textbook/frontmatter.yaml
@@ -1 +1,7 @@
-visible: false
\ No newline at end of file
+visible: false
+
+pedagogic_paths:
+  - slug: learning-about-light
+    level: 2
+  - slug: understanding-virtual-reality
+    level: 1
\ No newline at end of file
diff --git a/01.courses/01.optics/03.the-nature-of-light/03.annex/frontmatter.yaml b/01.courses/01.optics/03.the-nature-of-light/03.annex/frontmatter.yaml
index d4df9eb1f..4b74d9d9a 100644
--- a/01.courses/01.optics/03.the-nature-of-light/03.annex/frontmatter.yaml
+++ b/01.courses/01.optics/03.the-nature-of-light/03.annex/frontmatter.yaml
@@ -1 +1,7 @@
-visible: false
\ No newline at end of file
+visible: false
+
+pedagogic_paths:
+  - slug: learning-about-light
+    level: 1
+  - slug: understanding-virtual-reality
+    level: 3