diff --git a/examples/components/simpleviewer.html b/examples/components/simpleviewer.html
index b1d6c9d19..987a14032 100644
--- a/examples/components/simpleviewer.html
+++ b/examples/components/simpleviewer.html
@@ -29,7 +29,7 @@ limitations under the License.
     }
   </style>
 
-  <link rel="stylesheet" href="../../build/components/pdf_viewer.css"/>
+  <link rel="stylesheet" href="../../build/components/pdf_viewer.css">
 
   <!-- for legacy browsers -->
   <script src="../../build/components/compatibility.js"></script>
diff --git a/examples/components/simpleviewer.js b/examples/components/simpleviewer.js
index 1934a5a6e..139adfa49 100644
--- a/examples/components/simpleviewer.js
+++ b/examples/components/simpleviewer.js
@@ -16,16 +16,17 @@
 'use strict';
 
 if (!PDFJS.PDFViewer || !PDFJS.getDocument) {
-  alert('Please built the library and components using\n' +
-    '  `node make generic components`');
+  alert('Please build the library and components using\n' +
+        '  `node make generic components`');
 }
 
-// If pdf.js must be execute via eval or pdf.worker.js is located at the
-// different location than pdf.js, specify workerSrc.
+// In cases when the pdf.worker.js is located at the different folder than the
+// pdf.js's one, or the pdf.js is executed via eval(), the workerSrc property
+// shall be specified.
 //
 // PDFJS.workerSrc = '../../build/pdf.worker.js';
 
-// Some PDFs need external cmaps
+// Some PDFs need external cmaps.
 //
 // PDFJS.cMapUrl = '../../external/bcmaps/';
 // PDFJS.cMapPacked = true;
diff --git a/examples/learning/helloworld.html b/examples/learning/helloworld.html
index 9518127ee..347dbbe99 100644
--- a/examples/learning/helloworld.html
+++ b/examples/learning/helloworld.html
@@ -30,8 +30,9 @@
   // PDFJS.disableWorker = true;
 
   //
-  // If pdf.js must be execute via eval or pdf.worker.js is located at the
-  // different location than pdf.js, specify workerSrc.
+  // In cases when the pdf.worker.js is located at the different folder than the
+  // pdf.js's one, or the pdf.js is executed via eval(), the workerSrc property
+  // shall be specified.
   //
   // PDFJS.workerSrc = '../../build/pdf.worker.js';
 
diff --git a/examples/learning/prevnext.html b/examples/learning/prevnext.html
index 4ab65d9e9..0da467b79 100644
--- a/examples/learning/prevnext.html
+++ b/examples/learning/prevnext.html
@@ -40,8 +40,9 @@
   // PDFJS.disableWorker = true;
 
   //
-  // If pdf.js must be execute via eval or pdf.worker.js is located at the
-  // different location than pdf.js, specify workerSrc.
+  // In cases when the pdf.worker.js is located at the different folder than the
+  // pdf.js's one, or the pdf.js is executed via eval(), the workerSrc property
+  // shall be specified.
   //
   // PDFJS.workerSrc = '../../build/pdf.worker.js';