diff --git a/2019/duble/README.md b/2019/duble/README.md
index 9b04f3b9d..a99917ec8 100644
--- a/2019/duble/README.md
+++ b/2019/duble/README.md
@@ -29,6 +29,9 @@ 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.
@@ -44,6 +47,20 @@ 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
diff --git a/bugs.md b/bugs.md
index 1deb29dcd..3581bb66e 100644
--- a/bugs.md
+++ b/bugs.md
@@ -2086,6 +2086,20 @@ 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