diff --git a/content/en-us/reference/engine/libraries/buffer.yaml b/content/en-us/reference/engine/libraries/buffer.yaml
index 22ed5c6d1..b693218e6 100644
--- a/content/en-us/reference/engine/libraries/buffer.yaml
+++ b/content/en-us/reference/engine/libraries/buffer.yaml
@@ -47,7 +47,7 @@ functions:
         type: number
         default:
         summary: |
-          Size of the buffer.
+          Size of the buffer in bytes. Must be a positive integer.
     returns:
       - type: buffer
         summary: ''