diff --git a/iron/distribution.yaml b/iron/distribution.yaml
index 7ca86a2210019..a0fc79ad69603 100644
--- a/iron/distribution.yaml
+++ b/iron/distribution.yaml
@@ -823,6 +823,17 @@ repositories:
       url: https://github.com/ros2/common_interfaces.git
       version: iron
     status: maintained
+  conditional_substitution:
+    doc:
+      type: git
+      url: https://github.com/ottojo/ros_conditional_substitution.git
+      version: main
+    source:
+      test_pull_requests: true
+      type: git
+      url: https://github.com/ottojo/ros_conditional_substitution.git
+      version: main
+    status: maintained
   console_bridge_vendor:
     doc:
       type: git