diff --git a/README.md b/README.md
index 3d9c621..fda8424 100644
--- a/README.md
+++ b/README.md
@@ -210,6 +210,10 @@ since the resulting format cannot be deserialized,
 this is primarily intended for debugging purposes,
 and i'd like to think it excels at that.
 
+### response
+
+some old, brief notes on biquads.
+
 ### rng64
 
 some notes on the random number generator that Ocarina of Time