diff --git a/README.md b/README.md
index b46d175..6a4098c 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 For a steady stream of TILs from a variety of rocketeers, checkout
 [til.hashrocket.com](https://til.hashrocket.com/).
 
-_809 TILs and counting..._
+_810 TILs and counting..._
 
 ---
 
@@ -604,6 +604,7 @@ _809 TILs and counting..._
 
 ### Ruby
 
+- [A Shorthand For Rerunning Failed Tests With RSpec](ruby/a-shorthand-for-rerunning-failed-tests-with-rspec.md)
 - [Are They All True?](ruby/are-they-all-true.md)
 - [Assoc For Hashes](ruby/assoc-for-hashes.md)
 - [Block Comments](ruby/block-comments.md)
diff --git a/ruby/a-shorthand-for-rerunning-failed-tests-with-rspec.md b/ruby/a-shorthand-for-rerunning-failed-tests-with-rspec.md
new file mode 100644
index 0000000..6a12eca
--- /dev/null
+++ b/ruby/a-shorthand-for-rerunning-failed-tests-with-rspec.md
@@ -0,0 +1,8 @@
+# A Shorthand For Rerunning Failed Tests With RSpec
+
+After running a group of tests -- whether it is the entire suite or just the
+tests in a file -- you may find that you have a few failures. Often the goal is
+to focus in on these failures and get back to a green test suite. Rather than
+rerunning everything each time you make a change, you can instruct `rspec` to
+just rerun the tests that failed. This can be done with the `--only-failures`
+flag or `--on` flag for short.