4 files changed, 5 insertions, 5 deletions
diff --git a/lib/generate/index.js b/lib/generate/index.js
index 43f9497..315ceda 100644
--- a/lib/generate/index.js
+++ b/lib/generate/index.js
@@ -11,7 +11,7 @@ var generate = function(root, output, options) {
     var files, summary, navigation, tpl;
 
     options = _.defaults(options || {}, {
-        // Book title, keyword, description
+        // Book title, description
         title: null,
         description: "Book generated using GitBook",
 
@@ -19,7 +19,7 @@ var generate = function(root, output, options) {
         github: null
     });
 
-    if (!options.github || !options.title) return Q.reject(new Error("Need options.github and optiosn.title"));
+    if (!options.github || !options.title) return Q.reject(new Error("Need options.github and options.title"));
 
 
     // Clean output folder
@@ -39,7 +39,7 @@ var generate = function(root, output, options) {
         files = _files;
 
         if (!_.contains(files, "SUMMARY.md") || !_.contains(files, "README.md")) {
-            return Q.reject(new Error("Invalid gitbook repository, need SUMMARY.md and README.md"));
+            return Q.reject(new Error("Invalid gitbook repository: need SUMMARY.md and README.md"));
         }
     })
 
diff --git a/lib/generate/template.js b/lib/generate/template.js
index 7e59443..d4e8cae 100644
--- a/lib/generate/template.js
+++ b/lib/generate/template.js
@@ -13,7 +13,6 @@ swig.setFilter('lines', function(content) {
 // return a templeter for page
 var initTemplate = function(options) {
     var tpl = swig.compileFile(path.resolve(__dirname, '../../templates/page.html'));
-    var nExercise = 1;
 
     options = _.defaults(options || {}, {
         // Base folder for input
diff --git a/lib/parse/navigation.js b/lib/parse/navigation.js
index 9ed82b9..145c873 100644
--- a/lib/parse/navigation.js
+++ b/lib/parse/navigation.js
@@ -6,7 +6,7 @@ function clean(obj) {
     return obj && _.omit(obj, ['articles', '_path']);
 }
 
-// Returns a map of
+// Returns from a summary a map of
 /*
     {
         "file/path.html": {
diff --git a/lib/parse/progress.js b/lib/parse/progress.js
index 7259e07..8cf7605 100644
--- a/lib/parse/progress.js
+++ b/lib/parse/progress.js
@@ -1,5 +1,6 @@
 var _ = require("lodash");
 
+// Returns from a navigation and a current file, a snapshot of current detailed state
 var calculProgress = function(navigation, current) {
     var n = _.size(navigation);
     var percent = 0, prevPercent = 0, currentChapter = null;