diff --git a/llvm/docs/LangRef.rst b/llvm/docs/LangRef.rst
--- a/llvm/docs/LangRef.rst
+++ b/llvm/docs/LangRef.rst
@@ -5599,7 +5599,10 @@
 
 Files are sometimes used in ``scope:`` fields, and are the only valid target
 for ``file:`` fields.
-Valid values for ``checksumkind:`` field are: {CSK_None, CSK_MD5, CSK_SHA1, CSK_SHA256}
+
+The ``checksum:`` and ``checksumkind:`` fields are optional. If one of these
+fields is present, then the other is required to be present as well. Valid
+values for ``checksumkind:`` field are: {CSK_MD5, CSK_SHA1, CSK_SHA256}
 
 .. _DIBasicType: