How can i format an index entry in the text?

[Fabio Schoen]

Sorry if this is an easy question, but I could not find  a way, say, t emphasize an index entry in the text.

Assume you would like to write:

This is an :index:`entry` which will appear in the index.

How can the word "entry" be, e.g., emphasized so that in the text it will read as 

This is an *entry* which will appear in the index.

But meanwhile it will o into the index?

Many thanks

fabio:index:`