diff --git a/README.md b/README.md
index e60573c..e528310 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,4 @@
 # cheatsheets
 Quick lookup documents for commonly used tools
+
+Comment 1: type git log to look at history of what you’ve done so far
diff --git a/bioinformatics.md b/bioinformatics.md
index bb0d639..8e8f4e6 100644
--- a/bioinformatics.md
+++ b/bioinformatics.md
@@ -24,3 +24,6 @@ The final command looks like this:
 ```
 findMotifsGenome.pl peaks.bed out_dir hg19 -bg background.bed -rna -len 4,5,6,7 -mset vertebrates -mis 1 -p 4
 ```
+My new note: git checkout checks out (i.e., restores) an old version of a file
+
+
diff --git a/unixcommandnotes.txt b/unixcommandnotes.txt
new file mode 100644
index 0000000..3d70360
--- /dev/null
+++ b/unixcommandnotes.txt
@@ -0,0 +1,21 @@
+pwd: present working directory
+~ : home directory
+cd: change directory
+ls: list directory contents (files)
+man: manual for whatever command you specify
+mkdir: make directory
+cd ..: change back to home directory
+touch file.txt: creat an empty file called "text"
+cat: look at file's contents
+echo "example" >> file. text: this will append "example" into the file "text"
+wc: line count
+mv: move (must specify origin and destination after)
+cp: copy (must specify origin and destination after)
+scp: secure copy
+chmod: permissions
+awk: extract lines based on desired specifications you input
+git init: makes a directory a git repo
+git add: tells git to start keeping track of something
+git commit -m: tells git to record your changes
+git diff: shows changes so you can review them
+