diff --git a/src/samplesTreeView.ts b/src/samplesTreeView.ts
index 27b102552924b2237ebc32f1bf3a7493f5f61ef4..ce9e4649fcf7f7502bedcb229ac5f3fb9809d73a 100644
--- a/src/samplesTreeView.ts
+++ b/src/samplesTreeView.ts
@@ -2,6 +2,7 @@ import * as vscode from "vscode";
 import { Store } from "./store";
 import * as path from "path";
 import { toSortedKeys } from "./util";
+import { EOL } from "os";
 
 export class SamplesTreeViewProvider
 	implements vscode.TreeDataProvider<string> {
@@ -24,13 +25,47 @@ export class SamplesTreeViewProvider
 			sample,
 			vscode.TreeItemCollapsibleState.None
 		);
+
+		let sampleData = this.store.samples.get(sample);
+		if (sampleData === undefined) {
+			vscode.window.showErrorMessage(
+				"Internal error when showing the sample tree"
+			);
+			throw new Error("Internal error when showing the sample tree");
+		}
+
+		let input = "";
+		let output = "";
+		sampleData.data.forEach(entry => {
+			if (entry.key === "input") {
+				input = entry.value;
+			}
+
+			if (entry.key === "output") {
+				output = entry.value;
+			}
+		});
+		let inplines = input.split(EOL);
+		let outlines = output.split(EOL);
+		let tooltip =
+			"*Input*: \n" +
+			(inplines.length < 12
+				? input
+				: inplines.slice(0, 12).join("\n") +
+				  `\n... ${inplines.length - 12} more lines`) +
+			"*Output*: \n" +
+			(outlines.length < 12
+				? output
+				: outlines.slice(0, 12).join("\n") +
+				  `\n... ${outlines.length - 12} more lines`);
+
 		item.contextValue = "sample";
 		item.command = {
 			command: "soicode.openSample",
 			title: "Open Sample",
-			arguments: [sample],
-			tooltip: "Open Sample"
-		}; // todo register as command
+			arguments: [sample]
+		};
+		item.tooltip = tooltip;
 
 		// switch(this.state.samples.get){
 		{