diff --git a/doc/src/pg_dev_classes.rst b/doc/src/pg_dev_classes.rst
index ccaf49c3b8..78e1dabcd1 100644
--- a/doc/src/pg_dev_classes.rst
+++ b/doc/src/pg_dev_classes.rst
@@ -34,5 +34,5 @@ some selected examples for derived classes of specific models.
    :name: lammpsbase
 
    pg_lammps
-   pg_input
    pg_atom
+   pg_input