diff --git a/README.md b/README.md
index 7f347fe..31ddc19 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,8 @@
 Linux-Commands-Cheat-Sheet
 ==========================
 
+[![Join the chat at https://gitter.im/petronbot/Linux-Commands-Cheat-Sheet](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/petronbot/Linux-Commands-Cheat-Sheet?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+
 A compilation of some commonly used Linux commands for beginners (and those of us who often just forget :))
 
 Files & Folders
@@ -33,6 +35,15 @@ Some common commands for navigating, moving, deleting & more!
 #####  Unzip a file or folder
 	tar -xvzf filename.tar.gz
 
+#####  Find and replace in a file
+	sed -i '' 's/old/new/g' file.ext
+
+- `sed` = Stream EDitor
+- `-i` = in-place (i.e. save back to original file)
+- `old` = regex to replace
+- `new` = text to replace it with
+- `g` = global (i.e. replace all, not just first)
+
 
 Transferring files
 ----------------
@@ -45,6 +56,12 @@ Securely (over SSH) and locally
 #####  Copy a folder from one location to another
 	cp -r /path/to/folder /path/to/dest
 
+#####  Sync two folders
+	rsync -a /path/to/folder /path/to/dest
+
+- `-a` = Archive, syncs recursively and preserves sym links, special and device files, modification times, group, owner, and permissions
+- Source folder can be a remote, e.g. `username@server.com:/path/to/folder`
+