diff --git a/README.md b/README.md
index 824526c..c3b96b0 100644
--- a/README.md
+++ b/README.md
@@ -50,3 +50,6 @@ $ pip install -e .
   python -m line_profiler -rmt module_to_profile.py.lprof
   > python -m line_profiler -rmt module_to_profile.py.lprof
   ```
+
+# Day 5 Resources
+- [5 Worlds](https://www.joelonsoftware.com/2002/05/06/five-worlds/) from Joel Spolsky's blog.