diff --git a/zip-0211.rst b/zip-0211.rst
index 1e06cdc1..33a47c99 100644
--- a/zip-0211.rst
+++ b/zip-0211.rst
@@ -13,8 +13,8 @@
 Terminology
 ===========
 
-The key words "MUST" and "MAY" in this document are to be interpreted as described in
-RFC 2119. [#RFC2119]_
+The key words "MUST", "SHOULD", and "OPTIONAL" in this document are to be interpreted
+as described in RFC 2119. [#RFC2119]_
 
 The term "network upgrade" in this document is to be interpreted as described in ZIP 200
 [#zip-0200]_.
@@ -55,7 +55,8 @@ by the Sapling upgrade, and we are not aware of others at the time of writing, t
 possibility of other cryptographic weaknesses cannot be entirely ruled out.
 
 In addition, the Zcash specification and implementation incurs complexity and
-"technical debt" from the requirement to support both shielded transaction protocols.
+"technical debt" from the requirement to support and test both shielded transaction
+protocols.
 
 Removing the ability to add to the Sprout shielded value pool balance, is a first step
 toward reducing this complexity and potential risk. This does not prevent extracting value
@@ -72,6 +73,9 @@ MUST be zero.
 When this proposal is activated, nodes and wallets MUST disable any facilities to
 send to Sprout addresses, and this SHOULD be made clear in user interfaces.
 
+Note that the facility to send to Sprout addresses, before activation of this proposal,
+is in any case OPTIONAL for a particular node or wallet implementation.
+
 
 Rationale
 =========
@@ -106,8 +110,8 @@ Security and Privacy Considerations
 The security motivations for making this change are described in the Motivation section.
 Privacy concerns that led to the current design are discussed in the Rationale section.
 
-Since all clients change their behaviour at the same time when this proposal activates,
-there is no additional client distinguisher.
+Since all clients change their behaviour at the same time from this proposal's activation
+height, there is no additional client distinguisher.
 
 
 Deployment