diff --git a/packages/coding-agent/CHANGELOG.md b/packages/coding-agent/CHANGELOG.md
index 87a66de2..1f5fc990 100644
--- a/packages/coding-agent/CHANGELOG.md
+++ b/packages/coding-agent/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Changed
+
+- **HTML Export Prefix**: Exported session files now use `pi-session-` prefix (e.g., `pi-session-2025-11-13T12-27-53-866Z_xxx.html`) for easier `.gitignore` filtering ([#72](https://github.com/badlogic/pi-mono/issues/72))
+
 ## [0.10.1] - 2025-11-27
 
 ### Added
diff --git a/packages/coding-agent/src/export-html.ts b/packages/coding-agent/src/export-html.ts
index 1880fdb7..4e2ebc03 100644
--- a/packages/coding-agent/src/export-html.ts
+++ b/packages/coding-agent/src/export-html.ts
@@ -336,10 +336,10 @@ export function exportSessionToHtml(sessionManager: SessionManager, state: Agent
 	const sessionFile = sessionManager.getSessionFile();
 	const timestamp = new Date().toISOString();
 
-	// Use session filename + .html if no output path provided
+	// Use pi-session- prefix + session filename + .html if no output path provided
 	if (!outputPath) {
 		const sessionBasename = basename(sessionFile, ".jsonl");
-		outputPath = `${sessionBasename}.html`;
+		outputPath = `pi-session-${sessionBasename}.html`;
 	}
 
 	// Read and parse session data