diff --git a/docs/1.0.md b/docs/1.0.md
index be54c3e..20e7660 100644
--- a/docs/1.0.md
+++ b/docs/1.0.md
@@ -411,7 +411,8 @@ to allow for file integrity checking.
 
 ## Source
 `<podcast:source>`
-This element defines a uri location for a `<podcast:alternateEnclosure>` media file.  It is meant to be used as a child of the `<podcast:alternateEnclosure>` element.
+This element defines a uri location for a `<podcast:alternateEnclosure>` media file.  It is meant to be used as a child of the `<podcast:alternateEnclosure>` element. At least one `<podcast:source>` element must be
+present within ever `<podcast:alternateEnclosure>` element.
 
 #### Parent
 `<podcast:alternateEnclosure>`
@@ -440,13 +441,14 @@ None
 
 ## Integrity
 `<podcast:integrity>`
-This element defines a method of verifying integrity of the media given either an [SRI-compliant integrity string](https://www.w3.org/TR/SRI/) or a base64 encoded PGP signature.
+This element defines a method of verifying integrity of the media given either an [SRI-compliant integrity string](https://www.w3.org/TR/SRI/) or a base64 encoded PGP signature.  This element is optional within a
+`<podcast:alternateEnclosure>` element.
 
 #### Parent
 `<podcast:alternateEnclosure>`
 
 #### Count
-Multiple
+Single
 
 #### Node Value
 None