diff --git a/c/ren.txt b/c/ren.txt
new file mode 100644
index 000000000..a988e609a
--- /dev/null
+++ b/c/ren.txt
@@ -0,0 +1,37 @@
+
+ lrec_reader_stdio_func_t
+lrec_reader_csv_stdio_func
+lrec_reader_dkvp_stdio_func
+lrec_reader_nidx_stdio_func
+lrec_reader_xtab_stdio_func
+
+ lrec_reader_mmap_func_t
+lrec_reader_csv_mmap_func
+lrec_reader_dkvp_mmap_func
+lrec_reader_nidx_mmap_func
+lrec_reader_xtab_mmap_func
+
+ lrec_writer_func_t
+lrec_writer_csv_func
+lrec_writer_dkvp_func
+lrec_writer_nidx_func
+lrec_writer_pprint_func
+lrec_writer_xtab_func
+
+plrec_reader_stdio_func
+
+--> also rename to include stdio
+--> also rename to include sof
+ reset_func_t
+reset_csv_func
+reset_csv_mmap_func
+reset_dkvp_func
+reset_dkvp_mmap_func
+reset_nidx_func
+reset_xtab_func
+
+xxx mapper funcs -- ?!?
+
+----------------------------------------------------------------
+xxx file renames too!!!
+xxx HDR_TOP_H renames too!!!
diff --git a/c/todo.txt b/c/todo.txt
index d42107c32..02b373a75 100644
--- a/c/todo.txt
+++ b/c/todo.txt
@@ -54,6 +54,8 @@ NEATEN
 !! xxx's in the code
 * source hygiene: top-of-header comments, readme re memory management, etc.
 
+* make an automated hdrtop checker & put it into the makefile
+
 * prune pix/ dir
 * makefile go/d/rs stuff -> language-comparisons/ dir
 * catc.c/catc0.c -> language-comparisons/ dir