diff --git a/src/Interface/KrnlGlobalOpInterface.td b/src/Interface/KrnlGlobalOpInterface.td
index f680118366..394c4f0605 100644
--- a/src/Interface/KrnlGlobalOpInterface.td
+++ b/src/Interface/KrnlGlobalOpInterface.td
@@ -20,20 +20,30 @@ include "mlir/IR/OpBase.td"
 
 def KrnlGlobalOpInterface : OpInterface<"KrnlGlobalOpInterface"> {
   let description = [{
+    A KrnlGlobalOp-like operation is one that holds global constant value. It has
+    `name` attribute, `shape` attribute, `offset` attribute, and `alighnment`
+    attribute. Its content is stored in the `value` attribute, which can be
+    converted when retrieving.
   }];
 
   let methods = [
-      InterfaceMethod<"Get the buffer for the constant value from value attribute. ",
+      InterfaceMethod<"Get the buffer for the constant value from value attribute. "
+                      "If conversions are required to get the buffer. It should be "
+		      "done in this method. The constant value is stored in newly  "
+		      "allocated buffer. The buffer needs to be freed afte use by  "
+		      "using `freeBuffer()`.",
           "::mlir::ArrayRef<char>", "getBuffer", (ins )
       >,
-      InterfaceMethod<"Get the size of the buffer for the constant value.",
+      InterfaceMethod<"Get the size of the buffer. ",
           "uint64_t", "getBufferSize", (ins )
       >,
       InterfaceMethod<"Free the buffer for the constant value retrieved from value "
                       "attribute.",
           "void", "freeBuffer", (ins "::mlir::ArrayRef<char>": $buffer)
       >,
-      InterfaceMethod<"Update the `value` attribute.",
+      InterfaceMethod<"Update the `value` attribute by converting existing `value` "
+                       "attribute. Assume to use getBuffer(), setValueAttr(), and  "
+		       "freeBuffer() in this function.",
           "void", "updateValueAttr", (ins )
       >,
       InterfaceMethod<"Get the value from the attribute.",