diff --git a/doc/dump.html b/doc/dump.html
index 90539182b0..3d0cbb18ef 100644
--- a/doc/dump.html
+++ b/doc/dump.html
@@ -583,6 +583,11 @@ per-atom quantities which could then be output into dump files.
 -DLAMMPS_GZIP option - see the <A HREF = "Section_start.html#start_2">Making
 LAMMPS</A> section of the documentation.
 </P>
+<P>The <I>atom/mpiio</I>, <I>custom/mpiio</I>, and <I>xyz/mpiio</I> styles are part of
+the MPIIO package.  They are only enabled if LAMMPS was built with
+that package.  See the <A HREF = "Section_start.html#start_3">Making LAMMPS</A>
+section for more info.
+</P>
 <P>The <I>xtc</I> style is part of the XTC package.  It is only enabled if
 LAMMPS was built with that package.  See the <A HREF = "Section_start.html#start_3">Making
 LAMMPS</A> section for more info.  This is
diff --git a/doc/dump.txt b/doc/dump.txt
index 74c1029c77..b02f09c5f5 100644
--- a/doc/dump.txt
+++ b/doc/dump.txt
@@ -569,6 +569,11 @@ To write gzipped dump files, you must compile LAMMPS with the
 -DLAMMPS_GZIP option - see the "Making
 LAMMPS"_Section_start.html#start_2 section of the documentation.
 
+The {atom/mpiio}, {custom/mpiio}, and {xyz/mpiio} styles are part of
+the MPIIO package.  They are only enabled if LAMMPS was built with
+that package.  See the "Making LAMMPS"_Section_start.html#start_3
+section for more info.
+
 The {xtc} style is part of the XTC package.  It is only enabled if
 LAMMPS was built with that package.  See the "Making
 LAMMPS"_Section_start.html#start_3 section for more info.  This is