Hi, Spaceskip glue with zero stretchability and shrinkability is not marked as such in log when spacefactor is not 1000. \spaceskip=1pt \setbox0=\hbox{I turn}\showbox0 Output: .\glue 1.0 Spacefactor does not change the glue (due to zero stretchability and shrinkability), so output must be: .\glue(\spaceskip) 1.0 Best, Igor