Update shell_cheatsheet.md

diff --git a/shell_cheatsheet.md b/shell_cheatsheet.md
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+++ b/shell_cheatsheet.md
@@ -71,7 +71,9 @@ Redirection operators can be used to redirect the ouput from a program from the
 
 
 
-### e) How to use the output of one command as the input to another with a pipe...
+#### b.1) How to use the output of one command as the input to another with a pipe...
+A special kind of redirection is called a pipe and is denoted by `|`. 
+
 ### f) That combining single-purpose filters with pipes is the most productive way to use the shell...
 ### g) That if a program conforms to Unix conventions, it can easily be combined with others...