diff --git a/pngstruct.h b/pngstruct.h
index 062f131d7..4d40d2d7b 100644
--- a/pngstruct.h
+++ b/pngstruct.h
@@ -342,10 +342,6 @@ struct png_struct_def
 #endif
 
 #ifdef PNG_WRITE_SUPPORTED
-   /* This is somewhat excessive, there is no obvious reason on write to
-    * allocate a buffer for each possible filtered row, only for the one being
-    * tested and the current best.
-    */
    png_bytep try_row;         /* buffer to save trial row when filtering */
 #endif
 
diff --git a/pngwutil.c b/pngwutil.c
index 14822aacb..73a766ba7 100644
--- a/pngwutil.c
+++ b/pngwutil.c
@@ -3030,7 +3030,6 @@ png_write_find_filter(png_structrp png_ptr, png_row_infop row_info)
 
       if (best_filter_value != last_tested_row_value)
       {
-         /* TO DO: make this redundant code into functions? */
          if (best_filter_value == PNG_FILTER_VALUE_SUB)
            png_setup_sub_row(png_ptr, bpp, row_buf, row_bytes); 
 
@@ -3042,7 +3041,6 @@ png_write_find_filter(png_structrp png_ptr, png_row_infop row_info)
 
          if (best_filter_value == PNG_FILTER_VALUE_PAETH)
            png_setup_paeth_row(png_ptr, bpp, row_buf, row_bytes); 
-
       }
 
       png_write_filtered_row(png_ptr, png_ptr->try_row, row_info->rowbytes+1);