update README and C standard: C99 doesn't require gcc extensions

Signed-off-by: hayati ayguen <h_ayguen@web.de>

1 files changed, 13 insertions, 6 deletions

diff --git a/README.md b/README.md
index 211dca1..27dd530 100644
--- a/README.md
+++ b/README.md
@@ -67,23 +67,30 @@ more code than I planned..
 
 ## The code:
 
-Good old C:
-FFT API is very very simple, just make sure that you read the comments in `pffft.h`.
-Fast convolution API is also very simple, just make sure that you read the comments 
+### Good old C:
+The FFT API is very very simple, just make sure that you read the comments in `pffft.h`.
+
+The Fast convolution's API is also very simple, just make sure that you read the comments 
 in `pffastconv.h`.
 
+### C++:
+A simple C++ wrapper is available in `pffft.hpp`.
 
-C++: a simple C++ wrapper is available in `pffft.hpp`.
 
+### Git:
 This archive's source can be downloaded with git including the submodules:
-
 ```
-git clone --recursive https://github.com/hayguen/pffft.git`
+git clone --recursive https://github.com/hayguen/pffft.git
 ```
 
 With `--recursive` the submodules for Green and Kiss-FFT are also fetched,
 to use them in the benchmark. You can omit the `--recursive`-option.
 
+For retrieving the submodules later:
+```
+git submodule update --init
+```
+
 
 ## CMake:
 There's now CMake support to build the static libraries `libPFFFT.a`