Update README.md for TCP ACK tracker disabling

README.md

@@ -36,6 +36,7 @@ cmake ../
 make
 ```
 
+### Static/shared build
 Note that by default, only the shared object is compiled. If you would
 like to generate a static library file, run:
 
@@ -46,6 +47,8 @@ cmake ../ -DLIBTINS_BUILD_SHARED=0
 The generated static/shared library files will be located in the 
 _build/lib_ directory.
 
+### C++11 support
+
 libtins is noticeable faster if you enable _C++11_ support. Therefore, 
 if your compiler supports this standard, then you should enable it. 
 In order to do so, use the _LIBTINS_ENABLE_CXX11_ switch:
@@ -54,6 +57,22 @@ In order to do so, use the _LIBTINS_ENABLE_CXX11_ switch:
 cmake ../ -DLIBTINS_ENABLE_CXX11=1
 ```
 
+### TCP ACK tracker
+
+The TCP ACK tracker feature requires the boost.icl library (header only).
+This feature is enabled by default but will be disabled if the boost
+headers are not found. You can disable this feature by using:
+
+```Shell
+cmake ../ -DLIBTINS_ENABLE_ACK_TRACKER=0
+```
+
+If your boost installation is on some non-standard path, use 
+the parameters shown on the
+[CMake FindBoost help](https://cmake.org/cmake/help/v3.0/module/FindBoost.html)
+
+### WPA2 decryption
+
 If you want to disable _WPA2_ decryption support, which will remove 
 openssl as a dependency for compilation, use the 
 _LIBTINS_ENABLE_WPA2_ switch:
@@ -62,6 +81,8 @@ _LIBTINS_ENABLE_WPA2_ switch:
 cmake ../ -DLIBTINS_ENABLE_WPA2=0
 ```
 
+### IEEE 802.11 support
+
 If you want to disable IEEE 802.11 support(this will also disable 
 RadioTap and WPA2 decryption), which will reduce the size of the 
 resulting library in around 20%, use the _LIBTINS_ENABLE_DOT11_ switch: