diff --git a/doc/read_data.html b/doc/read_data.html
index 56e300f1d8..af7f7ec705 100644
--- a/doc/read_data.html
+++ b/doc/read_data.html
@@ -310,7 +310,7 @@ and similarly for y and z.  If this body is rotated (via the
 right-hand rule) by an angle theta around a unit vector (a,b,c), then
 the quaternion that represents its new orientation is given by
 (cos(theta/2), a*sin(theta/2), b*sin(theta/2), c*sin(theta/2)).  These
-4 components are quatw, quati, quatj, and quatk as specfied above.
+4 components are quatw, quati, quatj, and quatk as specified above.
 LAMMPS normalizes each atom's quaternion in case (a,b,c) was not a
 unit vector.
 </P>
diff --git a/doc/read_data.txt b/doc/read_data.txt
index cd798c0d6f..b82d8f8964 100644
--- a/doc/read_data.txt
+++ b/doc/read_data.txt
@@ -287,7 +287,7 @@ and similarly for y and z.  If this body is rotated (via the
 right-hand rule) by an angle theta around a unit vector (a,b,c), then
 the quaternion that represents its new orientation is given by
 (cos(theta/2), a*sin(theta/2), b*sin(theta/2), c*sin(theta/2)).  These
-4 components are quatw, quati, quatj, and quatk as specfied above.
+4 components are quatw, quati, quatj, and quatk as specified above.
 LAMMPS normalizes each atom's quaternion in case (a,b,c) was not a
 unit vector.