diff --git a/preserves-path.md b/preserves-path.md
index d9aeb29..77e8755 100644
--- a/preserves-path.md
+++ b/preserves-path.md
@@ -116,6 +116,10 @@ Design choice: How should comparison work? Should `lt 1.0f` accept not only `0.9
 `#t` and `#f` (since `Boolean` comes before `Float` in the Preserves total ordering)? Should
 `lt 1.0f` accept `0.9` and `0` as well as `0.9f`?
 
+## Functions
+
+        <count selector>        ;; Counts number of results of selector
+
 ## Transformers
 
 e.g. stringify results; sequenceify results (see "+" operator); setify