missing \tempo mark (minimal example attached)

[nothingwavering]

My tempo mark is not showing up.  Here is a minimal example:

\version "2.16.0"

<<
    \new Staff { 
        c'1
            \tempo 4 = 42 
        s1
    }
    \new Lyrics \lyricmode {
        \skip 1 \skip 4
        "^ should have tempo here"1
    }
>>


However, if I take out the \skip 4, so that the lyric happens at exactly the 
same time as the \tempo mark, lo and behold the tempo mark DOES appear.  Is 
this a bug in Lilypond, or is there some principal about about tempo marks that 
I have been missing?