Updated ReadMe

README.md

@@ -11,7 +11,7 @@ if you need **iOS Class Guard Pro** with more features [click here](#pro-version
 
 Version
 -----------
-0.7
+0.8
 
 Do I need It?
 -----------
@@ -77,6 +77,20 @@ curl -o obfuscate_project https://raw.githubusercontent.com/Polidea/ios-class-gu
 
 The presented way is the simplest one. You can also add additional target that will automatically regenerate the symbols map during compilation.
 
+Pre compiled header file
+-----------
+After obfuscation, iOS-Class-Guard will try to add generated symbols header (`symbols.h`) to your project's `*.pch` file. However, projects created in Xcode 6 and higher doesn't contain `*.pch` file by default. If your project doesn't contain any `*.pch` file, you will have to add it manually **before obfuscation**. 
+
+To add `*.pch` file to your project:
+
+1. Create file with `.pch` extension in your project's root directory. In Xcode go to `File -> New -> File -> iOS -> Other -> PCH File`
+
+2. At the target's *Build Settings*, in *Apple LLVM - Language* section, set **Prefix Header** to your PCH file name.
+
+3. At the target's *Build Settings*, in *Apple LLVM - Language* section, set **Precompile Prefix Header** to `YES`.
+
+For more details please refer to [this](http://stackoverflow.com/a/24524692/1219382) Stack Overflow question.
+
 Example
 -----------
 You can take a look what changes are required and how it works in some example projects.
@@ -96,7 +110,7 @@ https://github.com/Polidea/ios-class-guard-example/tree/master/SWTableViewCell-o
 Command Line Options
 -----------
 ```
-ios-class-guard 0.7 (64 bit)
+ios-class-guard 0.8 (64 bit)
 Usage: ios-class-guard [options] <mach-o-file>
 
   where options are: