diff --git a/react/react.d.ts b/react/react.d.ts
index 5178ad28a6..30ab2db256 100644
--- a/react/react.d.ts
+++ b/react/react.d.ts
@@ -1181,6 +1181,12 @@ declare namespace __React {
 
         imeMode?: any;
 
+        /**
+         * Defines how the browser distributes space between and around flex items
+         * along the main-axis of their container.
+         */
+        justifyContent?: "flex-start" | "flex-end" | "center" | "space-between" | "space-around";
+
         layoutGrid?: any;
 
         layoutGridChar?: any;