diff --git a/README.md b/README.md
index 0e28475..9db48ee 100644
--- a/README.md
+++ b/README.md
@@ -36,3 +36,9 @@ longer string in the middle and then calculating the two parts sperately.
 
 If that can be done, it should be easy to turn on the threads and make run this
 on all the cores.
+
+## Templating the code
+
+There's nothing in the code that's specific to `std::string`, and there's no
+real reason for keeping it restricted to `std::string`. Making this a template
+should be trivial.
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