-To use `tracef()`, include `<lttng/tracef.h>` where you need it, and
-link your application with `liblttng-ust`. See the <<example,EXAMPLE>>
+To use `tracef()` or `vtracef()`, include `<lttng/tracef.h>` where you need it,
+and link your application with `liblttng-ust`. See the <<example,EXAMPLE>>