diff --git a/bin/cli.js b/bin/cli.js
index b5647ca..bce6b95 100755
--- a/bin/cli.js
+++ b/bin/cli.js
@@ -10,16 +10,20 @@ const cli = meow(
 
   Options
     --sequential-init  Avoid hypothetical concurrent initialization collisions.
+    --debug Output debugging information.
+    --help Help info.
 
   Examples
     $ multi-semantic-release
 `,
 	{
 		flags: {
-			/*execasync: {
+			sequentialInit: {
 				type: "boolean",
-				alias: "sync",
-			},*/
+			},
+			debug: {
+				type: "boolean",
+			},
 		},
 	}
 );
diff --git a/bin/runner.js b/bin/runner.js
index 83c064d..30ee54b 100644
--- a/bin/runner.js
+++ b/bin/runner.js
@@ -1,4 +1,8 @@
 module.exports = (flags) => {
+	if (flags.debug) {
+		require("debug").enable("msr:*");
+	}
+
 	// Imports.
 	const getWorkspacesYarn = require("../lib/getWorkspacesYarn");
 	const multiSemanticRelease = require("../lib/multiSemanticRelease");
diff --git a/lib/createInlinePluginCreator.js b/lib/createInlinePluginCreator.js
index 1b625f9..93450ca 100644
--- a/lib/createInlinePluginCreator.js
+++ b/lib/createInlinePluginCreator.js
@@ -1,5 +1,5 @@
 const { writeFileSync } = require("fs");
-const { once } = require("lodash");
+const debug = require("debug")("msr:inlinePlugin");
 const getCommitsFiltered = require("./getCommitsFiltered");
 const { getManifest, getIndent } = require("./getManifest");
 const hasChangedDeep = require("./hasChangedDeep");
@@ -88,7 +88,11 @@ function createInlinePluginCreator(packages, multiContext, synchronizer) {
 				todo().find((p) => !p._ready)
 			);
 
-			return plugins.verifyConditions(context);
+			const res = await plugins.verifyConditions(context);
+
+			debug("verified conditions: %s", pkg.name);
+
+			return res;
 		};
 
 		/**
@@ -129,6 +133,9 @@ function createInlinePluginCreator(packages, multiContext, synchronizer) {
 			// Make sure type is "patch" if the package has any deps that have changed.
 			if (!pkg._nextType && hasChangedDeep(pkg._localDeps)) pkg._nextType = "patch";
 
+			debug("commits analyzed: %s", pkg.name);
+			debug("release type: %s", pkg._nextType);
+
 			// Return type.
 			return pkg._nextType;
 		};
@@ -195,6 +202,8 @@ function createInlinePluginCreator(packages, multiContext, synchronizer) {
 				notes.push(bullets.join("\n"));
 			}
 
+			debug("notes generated: %s", pkg.name);
+
 			// Return the notes.
 			return notes.join("\n\n");
 		};
@@ -212,6 +221,8 @@ function createInlinePluginCreator(packages, multiContext, synchronizer) {
 
 			const res = await plugins.publish(context);
 
+			debug("published: %s", pkg.name);
+
 			// istanbul ignore next
 			return res.length ? res[0] : {};
 		};
@@ -232,6 +243,8 @@ function createInlinePluginCreator(packages, multiContext, synchronizer) {
 			})
 		);
 
+		debug("inlinePlugin created: %s", pkg.name);
+
 		return inlinePlugin;
 	}
 
diff --git a/lib/getSynchronizer.js b/lib/getSynchronizer.js
index 0dc7f7b..6e032fd 100644
--- a/lib/getSynchronizer.js
+++ b/lib/getSynchronizer.js
@@ -1,5 +1,6 @@
 const EventEmitter = require("promise-events");
 const { identity } = require("lodash");
+const debug = require("debug")("msr:synchronizer");
 
 /**
  * Cross-packages synchronization context.
@@ -32,6 +33,8 @@ const getSynchronizer = (packages) => {
 
 	const emit = (probe, pkg) => {
 		const name = getEventName(probe, pkg);
+		debug("ready: %s", name);
+
 		return store.evt[name] || (store.evt[name] = ee.emit(name));
 	};
 
@@ -54,6 +57,7 @@ const getSynchronizer = (packages) => {
 				.filter(filter)
 				.every((p) => p.hasOwnProperty(probe))
 		) {
+			debug("ready: %s", probe);
 			emit(probe);
 		}
 
@@ -65,6 +69,8 @@ const getSynchronizer = (packages) => {
 		if (getLucky[probe]) {
 			return;
 		}
+		const name = getEventName(probe, pkg);
+		debug("lucky: %s", name);
 
 		getLucky[probe] = emit(probe, pkg);
 	};