diff --git a/content/template-editor/reference-liquid-helpers.mdx b/content/template-editor/reference-liquid-helpers.mdx
index a601a7019..5ae7340be 100644
--- a/content/template-editor/reference-liquid-helpers.mdx
+++ b/content/template-editor/reference-liquid-helpers.mdx
@@ -59,7 +59,10 @@ The Knock template editor uses Liquid syntax for control flow and variable decla
       "date",
       <div key="date_description">
         This filter has been extended to take an additional{" "}
-        <code>timezone</code> option.
+        <code>timezone</code> option. It accepts strftime-style format strings,
+        but Knock's Liquid implementation does not support the full strftime
+        specification. Notably, <code>%e</code> and <code>%l</code> are not
+        fully supported.
       </div>,
       '{{ startDate | date: "%-I:%M %p %Z" , "America/New_York" }}',
       "2:30 PM EST",