diff --git a/README.md b/README.md
index 7c8b11cc..3d41a2f2 100644
--- a/README.md
+++ b/README.md
@@ -46,7 +46,7 @@ Click below to see the demo in a web browser:<br>
 
 1. Set up an Angular project and install dependencies:
    ```
-   npm i three dagre atft --save
+   npm i three dagre atft yaml --save
    npm i @types/dagre @types/three --save-dev
    ```
 3. Import library into your module:
diff --git a/projects/atft/README.md b/projects/atft/README.md
index 4c7a06c7..37210970 100644
--- a/projects/atft/README.md
+++ b/projects/atft/README.md
@@ -46,7 +46,7 @@ Click below to see the demo in a web browser:<br>
 
 1. Set up an Angular project and install dependencies:
    ```
-   npm i three dagre atft --save
+   npm i three dagre atft yaml --save
    npm i @types/dagre @types/three --save-dev
    ```
 2. Import library into your module: