diff --git a/index.html b/index.html
index 2c99cfa..09e9030 100644
--- a/index.html
+++ b/index.html
@@ -830,9 +830,9 @@ <h3>JsonWebKey</h3>
 for an instance of a public key with a compound key identifier.
                 </p>
                 <p>
-The OPTIONAL `alg` property identifies the algorithm intended
-for use with the public key. Although optional, it is RECOMMENDED that `alg`
-be included, to avoid security issues that arise when using the same key with multiple
+The REQUIRED `alg` property identifies the algorithm intended
+for use with the public key, which is
+included to prevent security issues that can arise when using the same key with multiple
 algorithms. If describing a key using an elliptic curve, the OPTIONAL `crv` property is used
 to identify the particular curve type of the public key. The OPTIONAL `kid` property is a hint
 used to help discover the key; if present, the `kid` value SHOULD match, or be included