diff --git a/_subsections/lesson-05.org b/_subsections/lesson-05.org
index 538bf70..eab2362 100755
--- a/_subsections/lesson-05.org
+++ b/_subsections/lesson-05.org
@@ -10,7 +10,7 @@
 - [[https://www.youtube.com/playlist?list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J][Playlist: Missing Semester]]
 - [[https://www.youtube.com/redirect?event=video_description&redir_token=QUFFLUhqbVVJc2RzZ25nMmlrVW5zVGRsTS1fX2ladmRPQXxBQ3Jtc0ttWjQ5Ujcyd19TekNncTZGNEp1eDc3RWhzTzhvMW9oSTFoUl9JbGt1Mi0yU3FLc00wVUx1UXNJdFQxTjBjMWphdUZxNnU1WUYzTmFqd3RRemNLUDBJMlZkV3B0SnB4RVhpaUhvWWtnc1RISW1WVzdYWQ&q=https%3A%2F%2Fmissing.csail.mit.edu%2F2020%2Fcommand-line%2F&v=e8BO_dYxk5c][class notes]]
 
-- Curr: https://youtu.be/e8BO_dYxk5c?si=lIzq1GgkvRoRriWj&t=1531
+- Curr: https://youtu.be/e8BO_dYxk5c?si=7tmshQsaihcvs-aP&t=2018
 
 *** timestamps
 :PROPERTIES:
@@ -25,8 +25,8 @@
 + [[https://www.youtube.com/watch?v=e8BO_dYxk5c&t=672s][11:12 - The Kill Command]]
 + [[https://www.youtube.com/watch?v=e8BO_dYxk5c&t=881s][14:41 - Terminal Multiplexer]]
 + [[https://www.youtube.com/watch?v=e8BO_dYxk5c&t=1112s][18:32 - The Key Bindings]]
-+ [[https://www.youtube.com/watch?v=e8BO_dYxk5c&t=1536s][25:00 - Dot Files]] *current*
-+ [[https://www.youtube.com/watch?v=e8BO_dYxk5c&t=1799s][29:59 - Context Based Configuration File]]
++ [[https://www.youtube.com/watch?v=e8BO_dYxk5c&t=1536s][25:00 - Dot Files]]
++ [[https://www.youtube.com/watch?v=e8BO_dYxk5c&t=1799s][29:59 - Context Based Configuration File]] *current*
 + [[https://www.youtube.com/watch?v=e8BO_dYxk5c&t=2004s][33:24 - Terminal Emulator]]
 + [[https://www.youtube.com/watch?v=e8BO_dYxk5c&t=2196s][36:36 - Aliases]]
 + [[https://www.youtube.com/watch?v=e8BO_dYxk5c&t=2286s][38:06 - Common Folder Structure]]
@@ -124,3 +124,45 @@ will show the suspended and running processes in background
   - sessions
   - windows
   - panes
+
+
+** dot files
+*** alias
+- remap a source series of characters to a longer series
+- alias takes a single argument, ie, do not use spaces
+- to show what an alias refers to pass the alias to the alias command
+  - e.g.
+#+begin_src bash
+~/somedirectory >>> alias myaliasedcommand
+myaliasedcommand='ls -lah'
+#+end_src
+
+**** examples
+- make an alias "ll" for a list command with flags
+#+begin_src bash
+alias ll="ls -lah"
+#+end_src
+
+- make an alias for git status
+#+begin_src bash
+alias gs="git status"
+#+end_src
+
+- alias to prompt for an override
+#+begin_src bash
+alias mv="mv -i"
+#+end_src
+
+*** text based configuration 'dot files'
+- called 'dot files' because they start with a dot
+  - .bashrc
+    - must be in the home directory
+  - PS1
+    - prompt variable for your prompt
+    - you can set it in the .bashrc file
+    - ~PS1=" >> "~
+
+  - .vimrc
+    - vim configuration file
+
+**  terminal emulator