diff --git a/lib/optparse.js b/lib/optparse.js
index 32ef1c6..78cdfb2 100755
--- a/lib/optparse.js
+++ b/lib/optparse.js
@@ -5,7 +5,7 @@
 //  See README.md for license.
 //
 var optparse = {};
-try{ optparse = exports } catch(e) {}; // Try to export the lib for node.js
+try{ optparse = exports } catch(e) {}; // Try to export the lib for Node.js
 (function(self) {
 var VERSION = '1.0.3';
 var LONG_SWITCH_RE = /^--\w/;
@@ -16,7 +16,7 @@ var EMAIL_RE = /^([0-9a-zA-Z]+([_.-]?[0-9a-zA-Z]+)*@[0-9a-zA-Z]+[0-9,a-z,A-Z,.,-
 var EXT_RULE_RE = /(\-\-[\w_-]+)\s+([\w\[\]_-]+)|(\-\-[\w_-]+)/;
 var ARG_OPTIONAL_RE = /\[(.+)\]/;
 
-// The default switch argument filter to use, when argument name doesnt match
+// The default switch argument filter to use, when argument name doesn’t match
 // any other names.
 var DEFAULT_FILTER = '_DEFAULT';
 var PREDEFINED_FILTERS = {};
@@ -26,8 +26,8 @@ function filter_text(value) {
     return value;
 }
 
-// Switch argument filter that expects an integer, HEX or a decimal value. An
-// exception is throwed if the criteria is not matched.
+// Switch argument filter that expects an integer, hex, or a decimal value. An
+// exception is thrown if the criteria is not matched.
 // Valid input formats are: 0xFFFFFFF, 12345 and 1234.1234
 function filter_number(value) {
     var m = NUMBER_RE.exec(value);
@@ -36,14 +36,14 @@ function filter_number(value) {
         // The number is in HEX format. Convert into a number, then return it
         return parseInt(m[1], 16);
     } else {
-        // The number is in regular- or decimal form. Just run in through
+        // The number is in regular or decimal form. Just run in through
         // the float caster.
         return parseFloat(m[2] || m[3]);
     }
 };
 
 // Switch argument filter that expects a Date expression. The date string MUST be
-// formated as: "yyyy-mm-dd" An exception is throwed if the criteria is not
+// formated as: "yyyy-mm-dd" An exception is thrown if the criteria is not
 // matched. An DATE object is returned on success.
 function filter_date(value) {
     var m = DATE_RE.exec(value);
@@ -51,7 +51,7 @@ function filter_date(value) {
     return new Date(parseInt(m[0]), parseInt(m[1]) - 1, parseInt(m[2]));
 };
 
-// Switch argument filter that expects an email address. An exception is throwed
+// Switch argument filter that expects an email address. An exception is thrown
 // if the criteria doesn`t match.
 function filter_email(value) {
     var m = EMAIL_RE.exec(value);
@@ -135,7 +135,7 @@ function build_rule(filters, short, expr, desc) {
     }
 }
 
-// Loop's trough all elements of an array and check if there is valid
+// Loops through all elements of an array and check if there is valid
 // options expression within. An valid option is a token that starts
 // double dashes. E.G. --my_option
 function contains_expr(arr) {
@@ -210,7 +210,7 @@ OptionParser.prototype = {
         }
     },
 
-    // Adds a custom filter to the parser. It's possible to override the
+    // Adds a custom filter to the parser. It’s possible to override the
     // default filter by passing the value "_DEFAULT" to the ´´name´´
     // argument. The name of the filter is automatically transformed into
     // upper case.