Updated documentation for issue #145

Source/SupportFunctions/arm_float_to_q31.c

@@ -60,6 +60,12 @@
  @note
  In order to apply rounding, the library should be rebuilt with the ROUNDING macro
  defined in the preprocessor section of project options.
+ 
+ @note If the input float values are very big (2**32) then the function
+ won't be able to saturate to the right values.
+ If you expect very big float values in the input array then you
+ should force those values to +1 or -1 before calling this function.
+ For reasonable float values (< 2**32), the function will saturate correctly.
  */
 
 #if defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE)