diff --git a/samples/Graph/Data/ACME/index.md b/samples/Graph/Data/ACME/index.md
index e08bdb8e3..5ebe8d823 100644
--- a/samples/Graph/Data/ACME/index.md
+++ b/samples/Graph/Data/ACME/index.md
@@ -1,5 +1,5 @@
 ---
-NodeType: Organization
+NodeType: Markdown
 Name: ACME
 Category: Task Management
 Description: Project and task management demo showcasing MeshWeaver's collaborative workflows and AI agent integration
diff --git a/samples/Graph/Data/Cornerstone/index.md b/samples/Graph/Data/Cornerstone/index.md
index ddf8c725e..7633c3a19 100644
--- a/samples/Graph/Data/Cornerstone/index.md
+++ b/samples/Graph/Data/Cornerstone/index.md
@@ -1,5 +1,5 @@
 ---
-NodeType: Organization
+NodeType: Markdown
 Name: Cornerstone
 Category: Insurance
 Description: Reinsurance pricing demo showcasing property risk management, geographic visualization, and Excel data import
diff --git a/samples/Graph/Data/Northwind/index.md b/samples/Graph/Data/Northwind/index.md
index ac71fb0ff..3e92fe550 100644
--- a/samples/Graph/Data/Northwind/index.md
+++ b/samples/Graph/Data/Northwind/index.md
@@ -1,5 +1,5 @@
 ---
-NodeType: Organization
+NodeType: Markdown
 Name: Northwind
 Category: Analytics
 Description: Gourmet food distribution analytics demonstrating MeshWeaver's data visualization and AI-assisted exploration capabilities