diff --git a/docs/pdf/util.tex b/docs/pdf/util.tex
index 4927a8bc..623d0c88 100644
--- a/docs/pdf/util.tex
+++ b/docs/pdf/util.tex
@@ -73,7 +73,7 @@ position as the corresponding entries in $x$.
 \end{enumerate}
 
 
-\subroutine{PSB\_HBIO\_MOD}{Input/Output in Harwell-Boeing format}
+%\subroutine{PSB\_HBIO\_MOD}{Input/Output in Harwell-Boeing format}
 
 \subroutine*{hb\_read}{Read a sparse matrix from a file}
 \syntax{call hb\_read}{a, iret, iunit, filename, b, mtitle}
@@ -157,7 +157,7 @@ An integer value; 0 means no error has been detected.
 
 
 
-\subroutine{PSB\_MMIO\_MOD}{Input/Output in MatrixMarket format}
+%\subroutine{PSB\_MMIO\_MOD}{Input/Output in MatrixMarket format}
 
 \subroutine*{mm\_mat\_read}{Read a sparse matrix from a file}
 \syntax{call mm\_mat\_read}{a, iret, iunit, filename}