diff --git a/zip-0221.html b/zip-0221.html
index 1337fb87..57f9094f 100644
--- a/zip-0221.html
+++ b/zip-0221.html
@@ -25,15 +25,15 @@ License: MIT
A client that is not a full participant in the network of Zcash peers. It can send and receive payments, but does not store or validate a copy of the block chain.
High probability
An event occurs with high probability if it occurs with probability
- \(1-O(1/2^λ)\)
+ \(1-O(1/2^\lambda)\)
, where
- \(λ\)
+ \(\lambda\)
is a security parameter.
Negligible probability
An event occurs with negligible probability if it occurs with probability
- \(O(1/2^λ)\)
+ \(O(1/2^\lambda)\)
, where
- \(λ\)
+ \(\lambda\)
is the security parameter.
Merkle mountain range (MMR)
A Merkle mountain range (MMR) is a binary hash tree that allows for efficient appends of new leaves without changing the value of existing nodes.
diff --git a/zip-0221.rst b/zip-0221.rst
index c7cd5613..b4314161 100644
--- a/zip-0221.rst
+++ b/zip-0221.rst
@@ -25,12 +25,12 @@ interpreted as described in ZIP 200. [#zip-0200]_
receive payments, but does not store or validate a copy of the block chain.
*High probability*
- An event occurs with high probability if it occurs with probability :math:`1-O(1/2^λ)`,
- where :math:`λ` is a security parameter.
+ An event occurs with high probability if it occurs with probability :math:`1-O(1/2^\lambda)`,
+ where :math:`\lambda` is a security parameter.
*Negligible probability*
- An event occurs with negligible probability if it occurs with probability :math:`O(1/2^λ)`,
- where :math:`λ` is the security parameter.
+ An event occurs with negligible probability if it occurs with probability :math:`O(1/2^\lambda)`,
+ where :math:`\lambda` is the security parameter.
*Merkle mountain range (MMR)*
A Merkle mountain range (MMR) is a binary hash tree that allows for efficient appends of