diff --git a/doc/implementation/theory.md b/doc/implementation/theory.md
index f01b1ba..50f07ff 100644
--- a/doc/implementation/theory.md
+++ b/doc/implementation/theory.md
@@ -1,6 +1,6 @@
 # Introduction
 
-[The readme](../../master/README.md) mentions a couple of goals for this
+[The readme](../../README.md) mentions a couple of goals for this
 project, including the following two:
 
 - Be clever about using the available horizontal space while not overflowing