diff --git a/browser.d.ts b/browser.d.ts
index a5d3330..81b982e 100644
--- a/browser.d.ts
+++ b/browser.d.ts
@@ -1,7 +1,8 @@
-// Type definitions for pdf-merger-js v3.4.0
+// Type definitions for pdf-merger-js v4.2.0
 // Project: https://github.com/nbesli/pdf-merger-js
 // Definitions by: Alexander Wunschik <https://github.com/mojoaxel/>
 //                 Daniel Hammer <https://github.com/danmhammer/>
+//                 Lukas Loeffler <https://github.com/LukasLoeffler>
 
 declare module "pdf-merger-js/browser" {
   class PDFMerger {
diff --git a/browser.js b/browser.js
index 2ef46d2..7f50da3 100644
--- a/browser.js
+++ b/browser.js
@@ -84,7 +84,7 @@ class PDFMerger {
 
   async _addFromToPage (inputFile, from, to) {
     if (typeof from !== 'number' || typeof to !== 'number' || from < 0 || from < 0) {
-      throw new Error('Invalid function parameter. \'from\' and \'to\' must be possitive \'numbers\'.')
+      throw new Error('Invalid function parameter. \'from\' and \'to\' must be positive \'numbers\'.')
     }
     if (to < from) {
       throw new Error('Invalid function parameter. \'to\' must be greater or eaqual to \'from\'.')
@@ -95,7 +95,7 @@ class PDFMerger {
     const pageCount = srcDoc.getPageCount()
 
     if (from >= pageCount || to >= pageCount) {
-      throw new Error(`Invalid function parameter. The document has not enought pages. (from:${from}, to:${to}, pages:${pageCount})`)
+      throw new Error(`Invalid function parameter. The document has not enough pages. (from:${from}, to:${to}, pages:${pageCount})`)
     }
 
     // create a array [2,3,4] with from=2 and to=4
diff --git a/index.js b/index.js
index ee1dbb8..a59e304 100644
--- a/index.js
+++ b/index.js
@@ -61,7 +61,7 @@ class PDFMerger {
 
   async _addFromToPage (input, from, to) {
     if (typeof from !== 'number' || typeof to !== 'number' || from < 1 || from < 1) {
-      throw new Error('Invalid function parameter. \'from\' and \'to\' must be possitive \'numbers\'.')
+      throw new Error('Invalid function parameter. \'from\' and \'to\' must be positive \'numbers\'.')
     }
     if (to < from) {
       throw new Error('Invalid function parameter. \'to\' must be greater or equal to \'from\'.')
@@ -72,7 +72,7 @@ class PDFMerger {
     const pageCount = srcDoc.getPageCount()
 
     if (from > pageCount || to > pageCount) {
-      throw new Error(`Invalid function parameter. The document has not enought pages. (from:${from}, to:${to}, pages:${pageCount})`)
+      throw new Error(`Invalid function parameter. The document has not enough pages. (from:${from}, to:${to}, pages:${pageCount})`)
     }
 
     const pages = Array.from({ length: (to - from) + 1 }, (_, i) => i + from - 1)
diff --git a/package-lock.json b/package-lock.json
index f75f31c..c2e2e49 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "pdf-merger-js",
-  "version": "4.1.2",
+  "version": "4.2.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index a7003fc..5b9ac59 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "pdf-merger-js",
-  "version": "4.1.2",
-  "description": "merge multible PDF documents, or parts of them, to a new PDF document",
+  "version": "4.2.0",
+  "description": "merge multiple PDF documents, or parts of them, to a new PDF document",
   "main": "./index.js",
   "types": "./index.d.ts",
   "browser": "./browser.js",