Update Readme.md

Author: scivision

Readme.md

@@ -42,8 +42,10 @@ run('test/test_main.m')
 
 ## Backend
 
-All non-native Matlab code functions use several fallbacks if native Matlab code isn't capable of thr task. 
-For example, [stdlib.filesystem_type](./+stdlib/filesystem_type.m) quickly determines if Java, .NET, or Python are available--if not, a system() call is a fallback to determine the filesystem type e.g. NTFS or ext4, etc.
+All non-native Matlab code functions use several fallbacks if native Matlab code isn't capable of the task. 
+For example, [stdlib.filesystem_type](./+stdlib/filesystem_type.m) quickly determines if Java, .NET, or Python are available--if not, a system() call is a fallback to determine the filesystem type e.g. NTFS or ext4, etc. 
+
+We don't currently use Mex, but it's a possible option for rhe future.
 
 Most Matlab-stdlib filesystem functions work without the
 [Java interface](./Readme_java.md).