Where to look up explanation of syntax

[Joseph N. Srednicki]

I downloaded a Lilypond file from the Mutopia site containing Bach’s chorale prelude O Mensch Bewein.

 

The first measure contains the following:

 

ef8.*5/6 \mordent [f32 ef f] f8. \trill ef32 f g16 af g f32 ef ef8 g16 f |

 

I searched, but I cannot locate the appropriate location the in the Lilypond documentation that explains the “*5/6” syntax.

 

Can someone point me to this documentation?

 

Thanks.

 

Joe Srednicki