add syntax flag in README

Author: JanLJL

README.rst

@@ -100,9 +100,9 @@ The usage of OSACA can be listed as:
   shows the program’s version number.
 --arch ARCH
   needs to be replaced with the target architecture abbreviation.
-  Possible options are ``SNB``, ``IVB``, ``HSW``, ``BDW``, ``SKX``, ``CSX``, ``ICL`` (Client), ``ICX`` (Server), ``SPR`` for the latest Intel micro architectures starting from Intel Sandy Bridge and ``ZEN[1-4]`` for AMD Zen architectures.
-  Furthermore, ``TX2`` for Marvell`s ARM-based ThunderX2 , ``N1`` for ARM's Neoverse, ``A72`` for ARM Cortex-A72, ``TSV110`` for the HiSilicon TaiShan v110, ``A64FX`` for Fujitsu's HPC ARM architecture, ``M1`` for the Apple M1-Firestorm performance core, and ``V2`` for the Neoverse V2 (used in NVIDIA's Grace CPU) are available.
-  If no micro-architecture is given, OSACA assumes a default architecture for x86/AArch64.
+  See `the table of supported microarchitectures below <https://github.com/RRZE-HPC/OSACA?tab=readme-ov-file#supported-microarchitectures>`__ for all possible options. If no micro-architecture is given, OSACA assumes a default architecture for x86/AArch64.
+--syntax SYNTAX
+  Define the assembly syntax (ATT, Intel) for x86. If no syntax is given, OSACA tries to determine automatically the syntax to use.
 --fixed
   Run the throughput analysis with fixed port utilization for all suitable ports per instruction.
   Otherwise, OSACA will print out the optimal port utilization for the kernel.