Added custom fake information to the readme documentation

README.md

@@ -250,6 +250,23 @@ the fake will return the values given in the parameter array in sequence.  When
 the end of the sequence is reached the fake will continue to return the last 
 value in the sequence indefinitely.
 
+## Custom Return Value Delegate
+
+You can specify your own function to provide the return value for the fake. This
+is done by setting the custom_fake member of the fake.  Here's an example:
+
+    #define MEANING_OF_LIFE 42
+    long my_custom_value_fake(void)
+    {
+        return MEANING_OF_LIFE;
+    }
+    TEST_F(FFFTestSuite, when_value_custom_fake_called_THEN_it_returns_custom_return_value)
+    {
+        longfunc0_fake.custom_fake = my_custom_value_fake;
+        long retval = longfunc0();
+        ASSERT_EQ(MEANING_OF_LIFE, retval);
+    }
+
 
 ## Find out more...
 
@@ -262,20 +279,14 @@ There is also a test suite for the framework under the test directory.
 So whats the point?
 
  * To make it easy to create fake functions for testing C code.
- * To be simple
+ * It is simple - just include a header file and you are good to go.
  * To work in both C and C++ test environments
  
-## What can it do? 
- * It maintains a call count for each fake function
- * It captures the arguments sent in each function call
- * It captures a call history
- * It is simple - just include a header file and you are good to go.
-
  
 ## Under the hood:
  * The fff.h header file is generated by a ruby script
  * There are tests under src/test
- * There are examples for testing an embedded UI under src/examples
+ * There is an example for testing an embedded UI and a hardware driver under src/examples
   
 
 ## Cheat Sheet