diff --git a/CHANGELOG.md b/CHANGELOG.md
index 41169a2..f096442 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,13 @@
+# 2.4.0
+
+- Now you can add the method `catalogRelatedInfo` that returns an NSURL to your example, if you wish to link to related information and resources.
+- A performance improvement when fetching all viable classes to build the navigation tree.
+
+## Source changes
+
+* [Add "related info" URLs to examples (#24)](https://github.com/material-foundation/cocoapods-catalog-by-convention/commit/ee57bf7bb544b105c5d91aaa2ef348d0f663a690) (Adrian Secord)
+* [[Runtime] Only select UIViewController subclasses (#22)](https://github.com/material-foundation/cocoapods-catalog-by-convention/commit/ce864aabf505978a3933a93bfcf048f5d41bc071) (Robert Moore)
+
 # 2.3.1
 
  minor bug fix introduced in 2.3.0 that returns wrong boolean values.
diff --git a/CatalogByConvention.podspec b/CatalogByConvention.podspec
index 3b99b11..7560cc8 100644
--- a/CatalogByConvention.podspec
+++ b/CatalogByConvention.podspec
@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name         = "CatalogByConvention"
-  s.version      = "2.3.1"
+  s.version      = "2.4.0"
   s.authors      = "Google Inc."
   s.summary      = "Tools for building a Catalog by Convention."
   s.homepage     = "https://github.com/material-foundation/cocoapods-catalog-by-convention"
diff --git a/example/Podfile.lock b/example/Podfile.lock
index e3a52b1..93973d6 100644
--- a/example/Podfile.lock
+++ b/example/Podfile.lock
@@ -1,5 +1,5 @@
 PODS:
-  - CatalogByConvention (2.2.0)
+  - CatalogByConvention (2.3.1)
   - CatalogExamples (1.0.0)
   - CatalogUnitTests (1.0.0):
     - Resistor
@@ -22,7 +22,7 @@ EXTERNAL SOURCES:
     :path: components/Resistor
 
 SPEC CHECKSUMS:
-  CatalogByConvention: 5df5831e48b8083b18570dcb804f20fd1c90694f
+  CatalogByConvention: 1df2d770271921f668a99245c7c4c129e78941ee
   CatalogExamples: cafe3e4eae3abc948d96beb626657455c1dfb327
   CatalogUnitTests: b7a746f12abb31a905654521ee926ea007ab7275
   Resistor: 36a9ae98666be3b4f34d8133fad442fa87fdbce2
diff --git a/src/CBCCatalogExample.h b/src/CBCCatalogExample.h
index 564c790..31deb60 100644
--- a/src/CBCCatalogExample.h
+++ b/src/CBCCatalogExample.h
@@ -53,4 +53,7 @@
 /** Return a description of the example. */
 - (nonnull NSString *)catalogDescription;
 
+/** Return a link to related information or resources. */
+- (nonnull NSURL *)catalogRelatedInfo;
+
 @end
diff --git a/src/CBCNodeListViewController.m b/src/CBCNodeListViewController.m
index 76f5afd..e7f5f84 100644
--- a/src/CBCNodeListViewController.m
+++ b/src/CBCNodeListViewController.m
@@ -85,6 +85,11 @@ - (NSString *)exampleDescription {
   return CBCDescriptionFromClass(_exampleClass);
 }
 
+- (NSURL *)exampleRelatedInfo {
+  NSAssert(_exampleClass != nil, @"This node has no associated example.");
+  return CBCRelatedInfoFromClass(_exampleClass);
+}
+
 - (BOOL)isPrimaryDemo {
   return CBCCatalogIsPrimaryDemoFromClass(_exampleClass);
 }
diff --git a/src/private/CBCRuntime.h b/src/private/CBCRuntime.h
index d7ccdc6..aad0663 100644
--- a/src/private/CBCRuntime.h
+++ b/src/private/CBCRuntime.h
@@ -60,6 +60,9 @@ FOUNDATION_EXTERN UIViewController *CBCViewControllerFromClass(Class aClass);
 /** Create a description from the provided class. **/
 FOUNDATION_EXTERN NSString *CBCDescriptionFromClass(Class aClass);
 
+/** Create a link to related information from the provided class. **/
+FOUNDATION_EXTERN NSURL *CBCRelatedInfoFromClass(Class aClass);
+
 #pragma mark Fix View Debugging
 
 /**
diff --git a/src/private/CBCRuntime.m b/src/private/CBCRuntime.m
index 044bfa8..738748a 100644
--- a/src/private/CBCRuntime.m
+++ b/src/private/CBCRuntime.m
@@ -94,6 +94,9 @@ BOOL CBCCatalogIsDebugLeaf(Class aClass) {
     if (hasIgnoredPrefix) {
       continue;
     }
+    if (![aClass isSubclassOfClass:[UIViewController class]]) {
+      continue;
+    }
     [classes addObject:aClass];
   }
 
@@ -135,6 +138,14 @@ BOOL CBCCatalogIsDebugLeaf(Class aClass) {
   return nil;
 }
 
+NSURL *CBCRelatedInfoFromClass(Class aClass) {
+  if ([aClass respondsToSelector:@selector(catalogRelatedInfo)]) {
+    NSURL *catalogRelatedInfo = [aClass catalogRelatedInfo];
+    return catalogRelatedInfo;
+  }
+  return nil;
+}
+
 #pragma mark Fix View Debugging
 
 void CBCFixViewDebuggingIfNeeded(void) {