diff --git a/doc/read_data.html b/doc/read_data.html
index 3739f6fe02..2e3ae89c3c 100644
--- a/doc/read_data.html
+++ b/doc/read_data.html
@@ -112,7 +112,7 @@ equivalent.
 <P>Many crystal structures are defined using three lattice constants <I>a</I>,
 <I>b</I>, and <I>c</I>, and three angles <I>alpha</I>, <I>beta</I> and <I>gamma</I>. The
 relationships between these quantities and the LAMMPS box dimensions
-(lx,ly,lz) = (xhi-zlo,yhi-ylo,zhi-zlo) and tilt factors (xy,xz,yz) are
+(lx,ly,lz) = (xhi-xlo,yhi-ylo,zhi-zlo) and tilt factors (xy,xz,yz) are
 as follows:
 </P>
 <CENTER><IMG SRC = "Eqs/box.jpg">
diff --git a/doc/read_data.txt b/doc/read_data.txt
index b9e771b121..f5aed7c4c8 100644
--- a/doc/read_data.txt
+++ b/doc/read_data.txt
@@ -109,7 +109,7 @@ equivalent.
 Many crystal structures are defined using three lattice constants {a},
 {b}, and {c}, and three angles {alpha}, {beta} and {gamma}. The
 relationships between these quantities and the LAMMPS box dimensions
-(lx,ly,lz) = (xhi-zlo,yhi-ylo,zhi-zlo) and tilt factors (xy,xz,yz) are
+(lx,ly,lz) = (xhi-xlo,yhi-ylo,zhi-zlo) and tilt factors (xy,xz,yz) are
 as follows:
 
 :c,image(Eqs/box.jpg)