diff --git a/parsers/ChangeLog b/parsers/ChangeLog
index 216f8b617dcee1d2d83215dc57bc472d0093a86b..e7d123455888324cfcc4af34621947cc43ea6d9e 100644
--- a/parsers/ChangeLog
+++ b/parsers/ChangeLog
@@ -108,7 +108,8 @@ XXXX-YY-ZZ RELEASER <admin@example.com>
       - Push Notifications (XEP-0357) (!543)
       - JSON Containers (XEP-0335) (!546)
     * Improvements:
-      - Add support for `<optional/> in XEP-0198 feature advertisment
+      - Add support for `<optional/>` and `<required/>` in XEP-0198 feature
+        advertisment.
       - Add support application-specific error conditions in XEP-0198
       - Keep unsupported vCard elements as `minidom::Element`, so that they
         get serialized back instead of being dropped.  We now also test for
diff --git a/parsers/src/sasl2.rs b/parsers/src/sasl2.rs
index 2312ca5fa7ece488b833d84b1c9d020e0599d28f..232da3f7502a69f999fc3968854990ea5fb93c9c 100644
--- a/parsers/src/sasl2.rs
+++ b/parsers/src/sasl2.rs
@@ -269,7 +269,13 @@ mod tests {
 
         let inline = auth.inline.unwrap();
         assert_eq!(inline.bind2.unwrap().inline_features.len(), 0);
-        assert_eq!(inline.sm.unwrap(), StreamManagement { optional: false });
+        assert_eq!(
+            inline.sm.unwrap(),
+            StreamManagement {
+                optional: false,
+                required: false
+            }
+        );
         assert_eq!(inline.payloads.len(), 0);
     }
 
diff --git a/parsers/src/sm.rs b/parsers/src/sm.rs
index d9e1996250cd7a40b5bcb827ca7f60cb7f6c5cf8..9b258ba97f7e7f834670b04ee6d0c1f437692239 100644
--- a/parsers/src/sm.rs
+++ b/parsers/src/sm.rs
@@ -133,7 +133,7 @@ pub struct Resumed {
     pub previd: StreamId,
 }
 
-// TODO: add support for optional and required.
+// TODO: Only allow either optional or required, not both.
 /// Represents availability of Stream Management in `<stream:features/>`.
 #[derive(FromXml, AsXml, PartialEq, Debug, Clone)]
 #[xml(namespace = ns::SM, name = "sm")]
@@ -141,6 +141,10 @@ pub struct StreamManagement {
     /// `<optional/>` flag.
     #[xml(flag)]
     pub optional: bool,
+
+    /// `<required/>` flag.
+    #[xml(flag)]
+    pub required: bool,
 }
 
 /// Application-specific error condition to use when the peer acknowledges
@@ -222,7 +226,7 @@ mod tests {
         assert_size!(R, 0);
         assert_size!(Resume, 16);
         assert_size!(Resumed, 16);
-        assert_size!(StreamManagement, 1);
+        assert_size!(StreamManagement, 2);
         assert_size!(HandledCountTooHigh, 8);
     }
 
@@ -237,7 +241,7 @@ mod tests {
         assert_size!(R, 0);
         assert_size!(Resume, 32);
         assert_size!(Resumed, 32);
-        assert_size!(StreamManagement, 1);
+        assert_size!(StreamManagement, 2);
         assert_size!(HandledCountTooHigh, 8);
     }
 
@@ -251,7 +255,9 @@ mod tests {
     #[test]
     fn stream_feature() {
         let elem: Element = "<sm xmlns='urn:xmpp:sm:3'/>".parse().unwrap();
-        StreamManagement::try_from(elem).unwrap();
+        let sm = StreamManagement::try_from(elem).unwrap();
+        assert_eq!(sm.optional, false);
+        assert_eq!(sm.required, false);
     }
 
     #[test]