diff --git a/components/script/layout_dom/node.rs b/components/script/layout_dom/node.rs
index c780170bf74..6fb20bc13b3 100644
--- a/components/script/layout_dom/node.rs
+++ b/components/script/layout_dom/node.rs
@@ -97,7 +97,10 @@ impl<'dom, LayoutDataType: LayoutDataTrait> ServoLayoutNode<'dom, LayoutDataType
             phantom: PhantomData,
         }
     }
-   
+
+    /// # Safety
+    ///
+    /// This function should not be called if there is no TrustedNodeAddress.
     pub unsafe fn new(address: &TrustedNodeAddress) -> Self {
         ServoLayoutNode::from_layout_js(LayoutDom::from_trusted_node_address(*address))
     }
diff --git a/components/script/layout_dom/shadow_root.rs b/components/script/layout_dom/shadow_root.rs
index 090d1e84f8b..de2da7a030f 100644
--- a/components/script/layout_dom/shadow_root.rs
+++ b/components/script/layout_dom/shadow_root.rs
@@ -70,7 +70,9 @@ impl<'dom, LayoutDataType: LayoutDataTrait> ServoShadowRoot<'dom, LayoutDataType
             phantom: PhantomData,
         }
     }
-
+    /// # Safety
+    ///
+    /// This function should not mutate StyleSharedRwLockReadGuard.
     pub unsafe fn flush_stylesheets(
         &self,
         stylist: &mut Stylist,