diff --git a/bindings/reserved-memory/ramoops.txt b/bindings/reserved-memory/ramoops.txt
index 0eba562fe5c6..c0db67bec227 100644
--- a/bindings/reserved-memory/ramoops.txt
+++ b/bindings/reserved-memory/ramoops.txt
@@ -45,6 +45,12 @@ Optional properties:
 - unbuffered: if present, use unbuffered mappings to map the reserved region
   (defaults to buffered mappings)
 
+- mem-type: determine the memory type of the reserved region, compatible with
+  <unbuffered>, 0: writecombine(same as <unbuffered> is not set), 1: noncached
+  (same as <unbuffered> is set), 2: normal memory(fully cached for better
+  performance)
+  (defaults to 0: writecombine)
+
 - no-dump-oops: if present, only dump panics (defaults to panics and oops)
 
 - flags: if present, pass ramoops behavioral flags (defaults to 0,