diff --git a/scripts/error-codes/codes.json b/scripts/error-codes/codes.json
index 546f4a2ee0..05888dfb21 100644
--- a/scripts/error-codes/codes.json
+++ b/scripts/error-codes/codes.json
@@ -141,5 +141,6 @@
   "139": "ReactTestRenderer: .update() can't be called after unmount.",
   "140": "Expected hook events to fire for the child before its parent includes it in onSetChildren().",
   "141": "Expected onSetChildren() to fire for a container child before its parent includes it in onSetChildren().",
-  "142": "Expected onBeforeMountComponent() parent and onSetChildren() to be consistent (%s has parents %s and %s)."
+  "142": "Expected onBeforeMountComponent() parent and onSetChildren() to be consistent (%s has parents %s and %s).",
+  "143": "React.Children.only expected to receive a single React element child."
 }