diff --git a/RELEASES.md b/RELEASES.md
index 284b18aa..b355367d 100644
--- a/RELEASES.md
+++ b/RELEASES.md
@@ -24,6 +24,11 @@ Linker
 ------
 - Remove exception for input map dependency processing (now that compiler no
   longer emits such a dependency).
+- Reduce peak memory usage by clearing buffer of `xmlo` reader between
+  events.
+  - How effective this is varies depending on the size of individual
+    entities within the XML document.  In some cases, it can reduce peak
+    memory usage by half.
 
 
 v18.0.3 (2021-07-21)
diff --git a/tamer/src/obj/xmlo/reader/mod.rs b/tamer/src/obj/xmlo/reader/mod.rs
index 9b24477c..318bfc8c 100644
--- a/tamer/src/obj/xmlo/reader/mod.rs
+++ b/tamer/src/obj/xmlo/reader/mod.rs
@@ -250,6 +250,11 @@ where
     ///
     /// TODO: Augment failures with context
     pub fn read_event<'a>(&mut self) -> XmloResult<XmloEvent<Ix>> {
+        // Just to cut down on peak memory usage, cleaning up after a
+        // previous run.  This does not affect behavior.
+        self.buffer.clear();
+        self.sub_buffer.clear();
+
         let event = self.reader.read_event(&mut self.buffer)?;
 
         // Ensure that the first encountered node is something we expect