Add commits to BAS 2.4 Kconfig file

interpreters/bas/Kconfig

@@ -9,5 +9,26 @@ config INTERPRETERS_BAS
 	---help---
 		This is a Basic interpreter written by Michael Haardt
 
+		NOTE: This interpreter requires a usable math.h header file.  By
+		default, the math library (and hence, math.h) are not provided by
+		NuttX.  Therefore, when the Basic code includes math.h it will
+		either fail to find the math.h header file or, worse, will take an
+		incompatible version of math.h from your toolchain.  The toolchain's
+		version of math.h will be incompatible because it will have been
+		implemented to work with a different version of the C library.
+
+		Normally, developers will use an optimized math library for their
+		processor architecture and do the following:
+
+		- Save a customized copy of math.h from your tool chain in
+		  nuttx/arch/<arch>/include
+		- Set CONFIG_ARCH_MATH_H=y in your .config file to select this
+		  architecture-specific math.h header file.
+
+		An option is to use the built-in, generic, unoptimized NuttX math
+		library that is selected by simply by:
+
+		- Set CONFIG_LIBM=y in your .config file
+
 if INTERPRETERS_BAS
 endif