diff --git a/datastock/_plot_BvsA_as_distribution_check.py b/datastock/_class04_plot_BvsA_as_distribution_check.py
similarity index 100%
rename from datastock/_plot_BvsA_as_distribution_check.py
rename to datastock/_class04_plot_BvsA_as_distribution_check.py
diff --git a/datastock/_plot_as_array_1d.py b/datastock/_class04_plot_as_array_1d.py
similarity index 100%
rename from datastock/_plot_as_array_1d.py
rename to datastock/_class04_plot_as_array_1d.py
diff --git a/datastock/_plot_as_array_234d.py b/datastock/_class04_plot_as_array_234d.py
similarity index 100%
rename from datastock/_plot_as_array_234d.py
rename to datastock/_class04_plot_as_array_234d.py
diff --git a/datastock/_plot_text.py b/datastock/_class04_plot_text.py
similarity index 100%
rename from datastock/_plot_text.py
rename to datastock/_class04_plot_text.py