diff --git a/src/core.ts b/src/core.ts
index 73d51e8..3ad6eb7 100644
--- a/src/core.ts
+++ b/src/core.ts
@@ -234,9 +234,25 @@ export class Response {
 
 	showWarnings() {
 		if (this.response.warnings && !this.bot.options.suppressAPIWarnings) {
-			for (let [key, info] of Object.entries(this.response.warnings)) {
-				// @ts-ignore
-				log(`[W] Warning received from API: ${key}: ${info.warnings}`);
+			if (Array.isArray(this.response.warnings)) {
+				// new error formats
+				for (let { code, module, info, html, text } of this.response.warnings) {
+					if (code === 'deprecation-help') {
+						// skip
+						continue;
+					}
+					const msg =
+						info || // errorformat=bc
+						text || // errorformat=wikitext/plaintext
+						html; // errorformat=html
+					log(`[W] Warning received from API: ${module}: ${msg}`);
+				}
+			} else {
+				// legacy error format (bc)
+				for (let [key, info] of Object.entries(this.response.warnings)) {
+					// @ts-ignore
+					log(`[W] Warning received from API: ${key}: ${info.warnings}`);
+				}
 			}
 		}
 	}
diff --git a/tests/core.test.js b/tests/core.test.js
index 572c366..2ed8149 100644
--- a/tests/core.test.js
+++ b/tests/core.test.js
@@ -1,8 +1,9 @@
 const { Request } = require('../build/core');
+const logger = require('../build/log');
 const { MwnError } = require('../build/error');
 
 const { expect, mwn } = require('./test_base');
-const { bot } = require('./local_wiki');
+const { bot, setup, teardown, sinon } = require('./local_wiki');
 
 describe('core', function () {
 	describe('Request', function () {
@@ -44,6 +45,11 @@ describe('core', function () {
 
 	describe('Response', function () {
 
+		before('logs in and gets token & namespaceInfo', setup);
+		after('teardown', teardown);
+
+		// Errors
+
 		it('default legacy error format (bc)', async () => {
 			await expect(bot.request({ action: 'qwertyuiop' }))
 				.to.be.eventually.rejectedWith('badvalue: Unrecognized value for parameter "action": qwertyuiop.')
@@ -84,5 +90,30 @@ describe('core', function () {
 				});
 		});
 
+		// Warnings
+
+		it('shows warnings', async () => {
+			sinon.spy(logger, 'log');
+			await bot.request({ action: 'query', titles: 'Main Page', prop: 'revisions', rvprop: 'content' });
+			expect(logger.log).to.have.been.calledTwice;
+			sinon.restore();
+		});
+
+		it('shows warnings (new errorformats)', async () => {
+			sinon.spy(logger, 'log');
+			await bot.request({ errorformat: 'html', action: 'query', titles: 'Main Page', prop: 'revisions', rvprop: 'content' });
+			expect(logger.log).to.have.been.calledOnce;
+			expect(logger.log.firstCall.firstArg).to.include("[W] Warning received from API: query+revisions: Because");
+
+			await bot.request({ errorformat: 'wikitext', action: 'query', titles: 'Main Page', prop: 'revisions', rvprop: 'content' });
+			expect(logger.log).to.have.been.calledTwice;
+			expect(logger.log.secondCall.firstArg).to.include("[W] Warning received from API: query+revisions: Because");
+
+			await bot.request({ errorformat: 'plaintext', action: 'query', titles: 'Main Page', prop: 'revisions', rvprop: 'content' });
+			expect(logger.log).to.have.been.calledThrice;
+			expect(logger.log.thirdCall.firstArg).to.include("[W] Warning received from API: query+revisions: Because");
+			sinon.restore();
+		});
+
 	});
 });