diff --git a/doc/create_atoms.html b/doc/create_atoms.html
index e4ab22c261..dff7b6c971 100644
--- a/doc/create_atoms.html
+++ b/doc/create_atoms.html
@@ -311,6 +311,9 @@ default settings.
 <P>An <A HREF = "atom_style.html">atom_style</A> must be previously defined to use this
 command.
 </P>
+<P>A rotation vector specified for a single molecule must be in
+the z-direction for a 2d model.
+</P>
 <P><B>Related commands:</B>
 </P>
 <P><A HREF = "lattice.html">lattice</A>, <A HREF = "region.html">region</A>, <A HREF = "create_box.html">create_box</A>,
diff --git a/doc/create_atoms.txt b/doc/create_atoms.txt
index 9a7fa5ffab..6fb3bf5fe2 100644
--- a/doc/create_atoms.txt
+++ b/doc/create_atoms.txt
@@ -302,6 +302,9 @@ default settings.
 An "atom_style"_atom_style.html must be previously defined to use this
 command.
 
+A rotation vector specified for a single molecule must be in
+the z-direction for a 2d model.
+
 [Related commands:]
 
 "lattice"_lattice.html, "region"_region.html, "create_box"_create_box.html,