diff --git a/doc/pdfio.md b/doc/pdfio.md
index 03ef6d3..ca1298e 100644
--- a/doc/pdfio.md
+++ b/doc/pdfio.md
@@ -763,6 +763,9 @@ pdfio_obj_t *img =
                                     /*interpolate*/true);
 ```
 
+> Note: Currently `pdfioFileCreateImageObjFromFile` does not support 12 bit JPEG
+> files or PNG files with an alpha channel.
+
 
 ### Page Dictionary Functions
 
diff --git a/examples/md2pdf.c b/examples/md2pdf.c
index ae17636..54272ed 100644
--- a/examples/md2pdf.c
+++ b/examples/md2pdf.c
@@ -780,7 +780,7 @@ format_code(docdata_t *dd,		// I - Document data
 
   lineheight = SIZE_CODEBLOCK * LINE_HEIGHT;
   dd->y      -= 2.0 * lineheight;
-  if (dd->y < dd->art_box.y1)
+  if ((dd->y - lineheight) < dd->art_box.y1)
   {
     new_page(dd);
 
@@ -1397,7 +1397,7 @@ render_line(docdata_t  *dd,		// I - Document data
   }
 
   dd->y -= margin_top + lineheight;
-  if (dd->y < dd->art_box.y1)
+  if ((dd->y - (margin_top > 0.0 ? lineheight : 0.0)) < dd->art_box.y1)
   {
     new_page(dd);