diff --git a/components/script/dom/dedicatedworkerglobalscope.rs b/components/script/dom/dedicatedworkerglobalscope.rs
index d70353958e5..dbfbfe2a6fa 100644
--- a/components/script/dom/dedicatedworkerglobalscope.rs
+++ b/components/script/dom/dedicatedworkerglobalscope.rs
@@ -464,7 +464,7 @@ impl DedicatedWorkerGlobalScope {
                     .mem_profiler_chan()
                     .run_with_memory_reporting(
                         || {
-                            // Step 29, Run the responsible event loop specified
+                            // Step 27, Run the responsible event loop specified
                             // by inside settings until it is destroyed.
                             // The worker processing model remains on this step
                             // until the event loop is destroyed,
diff --git a/components/script/dom/serviceworkerglobalscope.rs b/components/script/dom/serviceworkerglobalscope.rs
index 0c5a37709c4..911c635e38d 100644
--- a/components/script/dom/serviceworkerglobalscope.rs
+++ b/components/script/dom/serviceworkerglobalscope.rs
@@ -280,7 +280,7 @@ impl ServiceWorkerGlobalScope {
     }
 
     #[allow(unsafe_code)]
-    // https://html.spec.whatwg.org/multipage/#run-a-worker
+    // https://w3c.github.io/ServiceWorker/#run-service-worker-algorithm
     pub fn run_serviceworker_scope(
         scope_things: ScopeThings,
         own_sender: Sender<ServiceWorkerScriptMsg>,
@@ -382,7 +382,7 @@ impl ServiceWorkerGlobalScope {
                     .mem_profiler_chan()
                     .run_with_memory_reporting(
                         || {
-                            // Step 29, Run the responsible event loop specified
+                            // Step 18, Run the responsible event loop specified
                             // by inside settings until it is destroyed.
                             // The worker processing model remains on this step
                             // until the event loop is destroyed,