diff --git a/docs/en/getting-started/local_quickstart_go.md b/docs/en/getting-started/local_quickstart_go.md
index 597e4275b11..851f071f7d1 100644
--- a/docs/en/getting-started/local_quickstart_go.md
+++ b/docs/en/getting-started/local_quickstart_go.md
@@ -39,7 +39,13 @@ from Toolbox.
     go mod init main
     ```
 
-1. In a new terminal, install the SDK Module:
+1. In a new terminal, install the Go SDK Module:
+    > [!IMPORTANT]
+    > **Breaking Change Notice**: As of version `0.6.0`, this SDK has transitioned to a multi-module structure.
+    > *   **For new versions (`v0.6.0`+)**: You must import specific modules (e.g., `go get github.com/googleapis/mcp-toolbox-sdk-go/core`).
+    > *   **For older versions (`v0.5.1` and below)**: The repository remains a single-module library (`go get github.com/googleapis/mcp-toolbox-sdk-go`).
+    > *   Please update your imports and `go.mod` accordingly when upgrading.
+
    {{< tabpane persist=header >}}
     {{< tab header="LangChain Go" lang="bash" >}}
     go get github.com/googleapis/mcp-toolbox-sdk-go/core
@@ -66,7 +72,7 @@ from Toolbox.
     {{< /tab >}}
     {{< /tabpane >}}
 
-2. Create a new file named `hotelagent.go` and copy the following code to create
+1. Create a new file named `hotelagent.go` and copy the following code to create
    an agent:
 
     {{< tabpane persist=header >}}