diff --git a/Cocoa Programming Guidelines.pdf b/Cocoa Programming Guidelines.pdf
index 5fc88ce..f746994 100644
Binary files a/Cocoa Programming Guidelines.pdf and b/Cocoa Programming Guidelines.pdf differ
diff --git a/Cocoa Programming Guidelines.tex b/Cocoa Programming Guidelines.tex
index b1acec1..81c2eba 100644
--- a/Cocoa Programming Guidelines.tex	
+++ b/Cocoa Programming Guidelines.tex	
@@ -23,6 +23,7 @@
 \usepackage[framemethod=TikZ]{mdframed}
 \usepackage{hyperref}
 \usepackage{tabto}
+\usepackage{minted}
 
 
 % Define section, subsection and subsubsection font size and color
@@ -84,9 +85,10 @@
 
 % Lists a code inside of a blue border
 \definecolor{BaliHaiColor}{HTML}{7CA1B3}
-\newenvironment{codelisting}
-{\footnotesize\mdframed[middlelinewidth=0.5pt, middlelinecolor=BaliHaiColor, skipabove=15pt]\verbatim}
-{\endverbatim\endmdframed\vspace{12pt}\normalsize}
+\newminted[codelisting]{objective-c}{tabsize=4, fontsize=\footnotesize}
+\usemintedstyle{xcode}
+\BeforeBeginEnvironment{codelisting}{\footnotesize\mdframed[middlelinewidth=0.5pt, middlelinecolor=BaliHaiColor, skipabove=15pt]}%
+\AfterEndEnvironment{codelisting}{\endmdframed\vspace{12pt}\normalsize}
 
 
 % Lists text inside yellow border
@@ -384,7 +386,7 @@ This approach has one more advantage, it is easier to add an error handling late
         if (error != NULL)
             *error = [NSError errorWithDomain:ExampleDomain
                                          code:1001
-                                     userInfo:@{NSLocalizedDescriptionKey: @"User name must have..."}];
+                                     userInfo:@{NSLocalizedDescriptionKey: @"User has to..."}];
         return NO;
     }
     
@@ -392,11 +394,11 @@ This approach has one more advantage, it is easier to add an error handling late
         if (error != NULL)
             *error = [NSError errorWithDomain:ExampleDomain
                                          code:1002
-                                     userInfo:@{NSLocalizedDescriptionKey: @"Password must have..."}];
+                                     userInfo:@{NSLocalizedDescriptionKey: @"Password has to..."}];
         return NO;
     }
     
-    // logging in code
+    // actual logging code
 }
 \end{codelisting}