diff --git a/source/build_corr_table.py b/source/build_corr_table.py
index 174da614..17072fd9 100644
--- a/source/build_corr_table.py
+++ b/source/build_corr_table.py
@@ -16,8 +16,9 @@ def replace_val(part, val):
     return vs + ' ' * (len(part) - len(vs))
 
 
-def prepend_row(tab_md, vals):
+def extend_with_row(tab_md, vals, where='before'):
     lines = tab_md.splitlines()
+    lines = lines[::-1] if where == 'after' else lines
     assert lines[0].startswith('+')
     L1 = lines[1]
     assert (L1[0], L1[-1]) == ('|', '|')
@@ -26,6 +27,7 @@ def prepend_row(tab_md, vals):
     for part, val in zip(parts, vals):
         new_parts.append(replace_val(part, val))
     L1 = '|'.join(new_parts)
+    lines = lines[::-1] if where == 'after' else lines
     return '\n'.join([lines[0], f'|{L1}|'] + lines)
 
 
@@ -39,11 +41,18 @@ def footerize_table(tab_md, indices=(-2, -1)):
     return '\n'.join(lines)
 
 
-def write_footerized(df, path, prepended=None):
+def to_md(df, prepended=None, extended=None):
     tab_md = df.to_markdown(index=None, tablefmt='grid', numalign="left")
     if prepended is not None:
-        tab_md = prepend_row(tab_md, prepended)
+        tab_md = extend_with_row(tab_md, prepended)
+    if extended is not None:
+        tab_md = extend_with_row(tab_md, extended, where='after')
+    return tab_md
+
+
+def write_footerized(df, path, prepended=None, extended=None):
     print(f'Writing {path}')
+    tab_md = to_md(df, prepended, extended)
     Path(path).write_text(footerize_table(tab_md))
 
 
@@ -67,7 +76,6 @@ def write_footerized(df, path, prepended=None):
 )
 
 sums = out.sum(axis='index')
-
 not_sums = [c for c in out if ' x ' not in c]
 sums[not_sums] = ''
 sums.iloc[0] = '**SUMS**'
@@ -87,6 +95,7 @@ def sumprod(col):
     return np.sum(col * ath)
 
 samp_sums = samp_out.agg(sumprod, axis='index')
+samp_sums.iloc[0] = '**Product sums**'
 
 samp_out2 = pd.concat([samp_out, samp_sums.to_frame().T])