diff --git a/src/biotraj/src/README b/src/biotraj/src/README
index 1083c8e..e54f82f 100644
--- a/src/biotraj/src/README
+++ b/src/biotraj/src/README
@@ -1,3 +1,5 @@
+# XDR plugin
+
 Low-level C libraries for manipulating GROMACS XTC and TRR files. This code
 is derived from xdrfile-1.1.4, available at