diff --git a/2019/duble/Makefile b/2019/duble/Makefile
index 763b9cfe4..3953508ca 100644
--- a/2019/duble/Makefile
+++ b/2019/duble/Makefile
@@ -137,6 +137,8 @@ all: data ${TARGET}
 
 ${PROG}:
 	${MAKE} `${UNAME}`
+	@echo "WARNING: this entry will likely leave sockets lying about in the current"
+	@echo "working directory. See the bugs.md and README.md for details."
 
 check-os: check-os.sh
 	${SHELL} ./check-os.sh ${LINES} ${COLUMNS}
diff --git a/2019/duble/README.md b/2019/duble/README.md
index 754ea6906..a99917ec8 100644
--- a/2019/duble/README.md
+++ b/2019/duble/README.md
@@ -29,10 +29,38 @@ Open another window / terminal.
 
 Open more terminals and repeat...
 
+### INABIAF - it's not a bug it's a feature! :-)
+
+
 WARNING: if the file is deleted it might lock any session still in use. These
 will have to be killed from another shell session or by closing the terminal
 tab.
 
+NOTE: this entry might leave sockets lying about in the current working
+directory which you'll have to delete manually. Here's an example in macOS:
+
+```sh
+$ ls -al
+srwxr-xr-x   1 ioccc  staff      0  6 Apr 08:19 .BDHFHALG
+srwxr-xr-x   1 ioccc  staff      0  6 Apr 08:15 .CGGHAMGC
+srwxr-xr-x   1 ioccc  staff      0  6 Apr 08:16 .CMDGAELH
+...
+```
+
+To get a list of files with this glob try:
+
+```sh
+ls -al |awk '{print $NF}' | grep -E '^\.[A-Z]+'
+```
+
+To delete them you can do:
+
+```sh
+find . -name '.[A-Z]*' -delete
+```
+
+though one might want to check that the program is not currently running. :-)
+
 ### Alternate code:
 
 An alternate version of this entry, [prog.alt.c](prog.alt.c), is provided.  This alternate
@@ -48,8 +76,8 @@ Use `prog.alt` as you would `prog` above.
 
 ## Judges' remarks:
 
-After starting the program, use the cursor keys, then try some modes, like "p"
-or "l" (they toggle).
+After starting the program, use the cursor keys, then try some modes, like `p`
+or `l` (they toggle).
 
 ## Author's remarks:
 
@@ -69,13 +97,15 @@ To build, type `make` (assuming gcc) or `make CC=clang`.
 
 Then you can start the program. It expects a file path as its first argument:
 
-    $ ./prog /tmp/drawing
+```sh
+./prog /tmp/drawing
+```
 
 (If not started this way, `prog` will refuse to start.)
 
 If the file does not exist, you will start with a blank drawing.
 
-If someone else (or another *instance of yourself*, maybe??) is already
+If someone else (or another *instance of yourself*, maybe?) is already
 editing this file, you will join the session!
 
 ### Edition features:
diff --git a/bugs.md b/bugs.md
index a84117db6..3581bb66e 100644
--- a/bugs.md
+++ b/bugs.md
@@ -2066,6 +2066,40 @@ but this is expected and the file `ioccc.html` will be generated properly.
 
 # 2019
 
+## [2019/duble](2019/duble/prog.c) ([README.md](2019/duble/README.md)
+## STATUS: INABIAF - please **DO NOT** fix
+
+This program will very likely leave sockets lying about in the current working
+directory. For instance [Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson)
+showed us this:
+
+```sh
+$ ls -al |grep '^s'
+srwxr-xr-x   1 cody  staff     0 Apr  6 08:19 .BDHFHALG=
+srwxr-xr-x   1 cody  staff     0 Apr  6 08:15 .CGGHAMGC=
+srwxr-xr-x   1 cody  staff     0 Apr  6 08:16 .CMDGAELH=
+srwxr-xr-x   1 cody  staff     0 Apr  3 08:47 .CMLBCCDA=
+[...]
+```
+
+This is NOT a bug and you'll have to (at least at this time?) delete the files
+manually. You shouldn't have to worry about these being added to git: it seems
+to ignore sockets (it did at least in macOS).
+
+NOTE: To get a list of files with this glob try:
+
+```sh
+ls -al |awk '{print $NF}' | grep -E '^\.[A-Z]+'
+```
+
+To delete them you can do:
+
+```sh
+find . -name '.[A-Z]*' -delete
+```
+
+though one might want to check that the program is not currently running. :-)
+
 ## [2019/ciura](2019/ciura/prog.c) ([README.md](2019/ciura/README.md))
 ## STATUS: known bug - please help us fix
 
diff --git a/todo.md b/todo.md
index d6a285191..45249efd8 100644
--- a/todo.md
+++ b/todo.md
@@ -1,12 +1,12 @@
 # A todo list of known things to check and/or do
-*Last updated: Wed 24 May 2023 12:35:37 UTC*
+*Last updated: Wed 31 May 2023 09:52:55 UTC*
 
 More things will likely be added over time and as items are done they _should
-be_ removed from the list IF AND ONLY IF (!!) we are certain it is done (many
-times it's thought that this was done only to find out that they are not). It is
-hoped that this will be referenced and updated as this is an easy way to keep
-track of things that have been done already and what have not been done (mostly
-not been done).
+be_ removed from the list IF AND ONLY IF (!!) we are _absolutely certain_ it is
+done (many times it's thought that a task was done only to find out it wasn't).
+It is hoped that this will be referenced and updated as this is an easy way to
+keep track of things that have been done already and what hasn't been done (in
+this file the case is mostly _NOT_ been done).
 
 - Find entries with bugs as well INABIAF and add to [bugs.md](/bugs.md).
     For instance a INABIAF section should be added to [bugs.md](bugs.md) for
@@ -47,14 +47,20 @@ fix any issues.
     except that a few years I am pretty sure I did not check typos (I'd say about
     1987 or 1988 through 1995 should be rechecked for typos).  It's very likely
     I won't keep this updated until it's finished but I wanted to note it now.
+    * NOTE: a while back (as of 31 May 2023) Cody noticed that some of the files
+    he already checked could be improved wrt formatting so he'll have to have a
+    quick look at the previously edited files; some he has done already but the
+    vast majority have not been checked. These should be relatively easy to fix
+    but will only be done _after_ the rest of the files are processed
+    (presumably with complete changes made :-) ).
 
 - Remove addresses from older winning entries but (if known) keep country code +
 add country code to winners.csv. As of half past 4 Pacific time on 22 April 2023
-only the years through 1986 are done. This should not take much time but I
-(Cody) am bored with it for now and would rather do other more important things.
-This will likely not be updated until after it's done (and when I remember to
-remove it - I expect that when I go for it I'll do it in one sitting or maybe a
-few sittings with a few brief breaks).
+only the years through 1986 have been done entirely. This should not take much
+time but I (Cody) am bored with it for now and would rather do other more
+important things.  This will likely not be updated until after it's done (and
+when I remember to remove it - I expect that when I go for it I'll do it in one
+sitting or maybe a few sittings with a few brief breaks).
 
 - Verify that [2004/gavin](2004/gavin/)'s [img/fs.tar](2004/gavin/img/fs.tar)
 contains the same version of files as under [2004/gavin](2004/gavin/) itself.
@@ -66,4 +72,17 @@ subdirectory and then typing the below from the entry's main directory
 
 - Try and see if I (Cody) can make [1985/sicherman](1985/sicherman/sicherman.c)
 even more like its original form. I have some ideas here but it might involve
-some discussion too.
+some discussion too. See 22 May 2023 commits for the improvements already made.
+
+- Check all Makefiles for notes / warnings on compilation and see if they can be
+moved to _after_ the compilation as they're more likely to be seen this way. In
+some cases this will have to be done in the Makefile via `|| :` (that might be
+good to have in the Makefiles anyway so that additional rules / targets are
+run) or else they'll have to be put above the compilation.
+    * Make compilation of targets use `|| :` in the Makefiles to allow
+    additional targets to compile and/or let warnings/notes be printed. An
+    important use of this is that some entries won't compile with clang due to
+    defects but the alternate version will. Whether this is a good idea is TBD
+    but it's noted here as a reminder to be discussed.
+
+