diff --git a/Awk.txt b/Awk.txt
index b809089..172f610 100644
--- a/Awk.txt
+++ b/Awk.txt
@@ -55,7 +55,7 @@ ps -ef | awk '!/^root/'
 
 # . for any character, ? zero or one, * zero or more, + one or more
 # ^ beginning of line, $ end of line
-# [] as expected
+# [] is any character in it e.g. [acf-j]
 # | for or
 
 # Show all set variables
diff --git a/Bash_Piping_and_Script_Automating.txt b/Bash_Piping_and_Script_Automating.txt
index ec89c7d..5c21ab5 100644
--- a/Bash_Piping_and_Script_Automating.txt
+++ b/Bash_Piping_and_Script_Automating.txt
@@ -41,6 +41,7 @@ ls /usr/share/figlet | rev | sort | rev
 ls /usr/share/figlet | rev | sort | rev > fonts.txt
 
 # But it dawned on me to just use sed. sed is short for stream editor
+# It is also based on ed, a very old text editor that is still on many systems
 man sed
 
 # so we can use a simple pattern matching format to delete lines that contain