diff --git a/MIGRATION_FROM_3_x.md b/MIGRATION_FROM_3_x.md
index d6bc28d8..002309b2 100644
--- a/MIGRATION_FROM_3_x.md
+++ b/MIGRATION_FROM_3_x.md
@@ -35,7 +35,7 @@ block-beta
 ```
 
 
-The following diagram illustrates architecture of PHP SDK v4:
+The following diagram illustrates the architecture of PHP SDK v4:
 
 ```mermaid
 block-beta