diff --git a/package.json b/package.json
index 64a8a32..ed42c29 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "@ztimson/ai-utils",
-	"version": "0.1.4",
+	"version": "0.1.5",
 	"description": "AI Utility library",
 	"author": "Zak Timson",
 	"license": "MIT",
diff --git a/src/llm.ts b/src/llm.ts
index c3c70bc..4f1702b 100644
--- a/src/llm.ts
+++ b/src/llm.ts
@@ -138,9 +138,15 @@ export class LLM {
 		return Math.ceil((text.length / 4) * 1.2);
 	}
 
-	async json(message: string, options: LLMRequest) {
+	/**
+	 * Ask a question with JSON response
+	 * @param {string} message Question
+	 * @param {LLMRequest} options Configuration options and chat history
+	 * @returns {Promise<{} | {} | RegExpExecArray | null>}
+	 */
+	async json(message: string, options?: LLMRequest) {
 		let resp = await this.ask(message, {
-			system: '',
+			system: 'Respond using a JSON blob',
 			...options
 		});
 		if(!resp?.[0]?.content) return {};