diff --git a/README.md b/README.md
index 934c147..2fe4e5a 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@ variety of languages and technologies. These are things that don't really
 warrant a full blog post. These are mostly things I learn by pairing with
 smart people at [Hashrocket](http://hashrocket.com/).
 
-_420 TILs and counting..._
+_421 TILs and counting..._
 
 ---
 
@@ -390,6 +390,7 @@ _420 TILs and counting..._
 - [Securely Remove Files](unix/securely-remove-files.md)
 - [SSH Escape Sequences](unix/ssh-escape-sequences.md)
 - [SSH With Port Forwarding](unix/ssh-with-port-forwarding.md)
+- [Sort In Numerical Order](unix/sort-in-numerical-order.md)
 - [Switch Versions of a Brew Formula](unix/switch-versions-of-a-brew-formula.md)
 - [View A Web Page In The Terminal](unix/view-a-web-page-in-the-terminal.md)
 - [Watch The Difference](unix/watch-the-difference.md)
diff --git a/unix/sort-in-numerical-order.md b/unix/sort-in-numerical-order.md
new file mode 100644
index 0000000..cf00d3a
--- /dev/null
+++ b/unix/sort-in-numerical-order.md
@@ -0,0 +1,34 @@
+# Sort In Numerical Order
+
+By default, the `sort` command will sort things alphabetically. If you have
+numerical input though, you may want a numerical sort. This is what the `-n`
+flag is for.
+
+If I have a directory of files with numbered names, sort doesn't quite do
+the job by itself.
+
+```bash
+$ ls | sort
+1.txt
+10.txt
+11.txt
+12.txt
+2.txt
+3.txt
+4.txt
+5.txt
+```
+
+with the `-n` flag, I get the sort order I am looking for.
+
+```bash
+$ ls | sort -n
+1.txt
+2.txt
+3.txt
+4.txt
+5.txt
+10.txt
+11.txt
+12.txt
+```