diff --git a/packages/react-reconciler/src/ReactFiberWorkLoop.new.js b/packages/react-reconciler/src/ReactFiberWorkLoop.new.js
index 03831988e2b2b..95c92b97c1e26 100644
--- a/packages/react-reconciler/src/ReactFiberWorkLoop.new.js
+++ b/packages/react-reconciler/src/ReactFiberWorkLoop.new.js
@@ -679,7 +679,7 @@ function markUpdateLaneFromFiberToRoot(
       warnAboutUpdateOnNotYetMountedFiberInDEV(sourceFiber);
     }
   }
-  // Walk the parent path to the root and update the child expiration time.
+  // Walk the parent path to the root and update the child lanes.
   let node = sourceFiber;
   let parent = sourceFiber.return;
   while (parent !== null) {
diff --git a/packages/react-reconciler/src/ReactFiberWorkLoop.old.js b/packages/react-reconciler/src/ReactFiberWorkLoop.old.js
index 6966472e0d16f..2757fb343aca3 100644
--- a/packages/react-reconciler/src/ReactFiberWorkLoop.old.js
+++ b/packages/react-reconciler/src/ReactFiberWorkLoop.old.js
@@ -679,7 +679,7 @@ function markUpdateLaneFromFiberToRoot(
       warnAboutUpdateOnNotYetMountedFiberInDEV(sourceFiber);
     }
   }
-  // Walk the parent path to the root and update the child expiration time.
+  // Walk the parent path to the root and update the child lanes.
   let node = sourceFiber;
   let parent = sourceFiber.return;
   while (parent !== null) {