diff --git a/doc/runtime_memory.rst b/doc/runtime_memory.rst
index 30770a6b68a13f4d6427ee957467d91a4b25c489..79f209f23f7a45561b8da1d4f1a839f4512c0ef6 100644
--- a/doc/runtime_memory.rst
+++ b/doc/runtime_memory.rst
@@ -238,7 +238,7 @@ Operations on SVM
 Image
 -----
 
-.. class:: ImageFormat([channel_order, channel_type])
+.. class:: ImageFormat(channel_order, channel_type)
 
     .. attribute:: channel_order