diff --git a/jsonschema-core.xml b/jsonschema-core.xml
index 5a078dc4..f4397b08 100644
--- a/jsonschema-core.xml
+++ b/jsonschema-core.xml
@@ -2404,7 +2404,7 @@
                         </t>
                         <t>
                             The annotation result of this keyword is the set of instance
-                            property names matched by this keyword.
+                            property names which are also present under this keyword.
                             This annotation affects the behavior of "additionalProperties" (in
                             this vocabulary) and "unevaluatedProperties" in the Unevaluated vocabulary.
                         </t>
@@ -2430,7 +2430,7 @@
                         </t>
                         <t>
                             The annotation result of this keyword is the set of instance
-                            property names matched by this keyword.
+                            property names matched by at least one property under this keyword.
                             This annotation affects the behavior of "additionalProperties" (in this
                             vocabulary) and "unevaluatedProperties" (in the Unevaluated vocabulary).
                         </t>