diff --git a/lib/SourceMapDevToolPlugin.js b/lib/SourceMapDevToolPlugin.js
index 117ca286f..6f0434f98 100644
--- a/lib/SourceMapDevToolPlugin.js
+++ b/lib/SourceMapDevToolPlugin.js
@@ -90,7 +90,7 @@ class SourceMapDevToolPlugin {
 				const tasks = [];
 				const reportProgress = (context && context.reportProgress) ? context.reportProgress : () => {};
 
-				reportProgress(0.0, "SourceMapDevToolPlugin generation starting");
+				reportProgress(0.0, "Generation starting...");
 				chunks.forEach(chunk => {
 					chunk.files.forEach(file => {
 						if(matchObject(file)) {
@@ -161,8 +161,7 @@ class SourceMapDevToolPlugin {
 					usedNamesSet.add(sourceName);
 				}
 				tasks.forEach((task, index) => {
-					let progressFloat = (1.0 / tasks.length * index).toFixed(2);
-					reportProgress(progressFloat, `Generating sourcemaps ${index + 1}/${tasks.length}`);
+					reportProgress(index / tasks.length, `Generating sourcemap ${index + 1} of ${tasks.length}: ${task.file}`);
 					const chunk = task.chunk;
 					const file = task.file;
 					const asset = task.asset;