Hide visibility of sinqController classes

README.md

@@ -309,4 +309,16 @@ If your driver uses another driver as a static dependency via git submodule whic
 - `git commit -m "Update turboPmac to 1.0"`
 - `git submodule update --init --recursive`
 
-This will update sinqMotor to the version specified in the 1.0 commit of turboPmac.
+This will update sinqMotor to the version specified in the 1.0 commit of turboPmac.
+
+### Exporting symbols
+
+By default, the symbols of classes and functions are hidden to avoid symbol clashes when loading
+multiple shared libraries which use `sinqMotor`. In order to compile this library with exported
+symbols, specifiy `-DHIDDEN= ` as a compiler flag (if using the given Makefile, this
+needs to be added to the `USR_CFLAGS`).
+
+Derived libraries can use the same mechanism via the macro `HIDDEN` (defined in `msgPrintControl.h`):
+```
+class HIDDEN turboPmacController : public sinqController
+```