diff --git a/luamml-tex.lua b/luamml-tex.lua
index 1dd3eb2..c76d1f7 100644
--- a/luamml-tex.lua
+++ b/luamml-tex.lua
@@ -40,6 +40,9 @@ local mlist_result
 
 local function save_result(xml, style)
   mlist_result = write_xml(make_root(xml, style))
+  if tex.count.tracingmathml > 1 then
+    texio.write_nl(mlist_result .. '\n')
+  end
 end
 
 luatexbase.add_to_callback('pre_mlist_to_hlist_filter', function(mlist, style)
@@ -87,6 +90,9 @@ lua.get_functions_table()[funcid] = function()
         "I was asked to provide MathML code for the last formula, but there weren't any new formulas since you last asked."
       })
   end
+  if tex.count.tracingmathml == 1 then
+    texio.write_nl(mlist_result .. '\n')
+  end
   tex.sprint(-2, tostring(pdf.immediateobj('stream', mlist_result, '/Subtype/application#2Fmathml+xml' .. token.scan_argument(true))))
   mlist_result = nil
 end
diff --git a/luamml.sty b/luamml.sty
index d78d4a2..d9ef869 100644
--- a/luamml.sty
+++ b/luamml.sty
@@ -2,6 +2,7 @@
   {Feel free to add a description here}
 
 \int_new:N \l__luamml_flag_int
+\int_new:N \tracingmathml
 \lua_now:n { require'luamml-tex' }
 
 \cs_new:Nn \luamml_flag_save: {
diff --git a/test_tex.tex b/test_tex.tex
index 18b1c24..90f3d7e 100644
--- a/test_tex.tex
+++ b/test_tex.tex
@@ -6,6 +6,7 @@
 \RegisterFamilyMapping\symletters{oml}
 \RegisterFamilyMapping\symlargesymbols{omx}
 \ExplSyntaxOn
+\tracingmathml2
 \pdfvariable compresslevel0
 \cs_new_protected:Npn \ShowMathMLObj {
   \message { \luamml_get_last_mathml_stream:e{}~0~R }