diff --git a/c/ren.txt b/c/ren.txt
index 6478ac807..fa181040c 100644
--- a/c/ren.txt
+++ b/c/ren.txt
@@ -1,12 +1,6 @@
 * \s+= alignment ... :/
-* also look for mapper funcs ...
 * search for "xxx rename"
 * pvstate paragraphing
-----------------------------------------------------------------
-
-mmap.*stdio & v.v. ???
-
-
 ----------------------------------------------------------------
 xxx file renames too!!!
-xxx HDR_TOP_H renames too!!!
+xxx HDR_TOP_H renames too!!! -- hdrtop --check?
diff --git a/c/todo.txt b/c/todo.txt
index 02b373a75..7a88cc799 100644
--- a/c/todo.txt
+++ b/c/todo.txt
@@ -6,19 +6,13 @@
 
 -> impl full-num scanner thruout including pnnx etc etc etc
 
+* note mtrand in extdeps @ mlrwik
+
 ================================================================
 FEATURES
 
 !! mmap impl: csv
 
-!! mmap renames x many
-   grep -i mmap tags|cpick 1|grep mmap|sort -u
-   * rename process funcs et al. while we're at it
-   * x_mmap vs. x_what?
-   * reader -> lrec_reader or file_reader
-   * mmap.c -> mmap_file_reader
-   * _x_mmap_ vs. _mmap_x_
-
 !! nidx via field widths; left/right space-strip -- *only* if headers also don't have whitespace!!!
 !! doc sub,sec2gmt,gmt2sec @ mlrwik. note fractional seconds are discarded due to clib.