diff --git a/src/lib/dns/rrclass-placeholder.h b/src/lib/dns/rrclass-placeholder.h
index cb4e0a2537..7879175c73 100644
--- a/src/lib/dns/rrclass-placeholder.h
+++ b/src/lib/dns/rrclass-placeholder.h
@@ -211,7 +211,7 @@ public:
     /// \brief Same as \c equals().
     bool operator==(const RRClass& other) const { return (equals(other)); }
 
-    /// \brief Return true iff two RRClasses are equal.
+    /// \brief Return true iff two RRClasses are not equal.
     ///
     /// This method never throws an exception.
     ///
diff --git a/src/lib/dns/rrtype-placeholder.h b/src/lib/dns/rrtype-placeholder.h
index 7b455ce9cc..216c72dc3f 100644
--- a/src/lib/dns/rrtype-placeholder.h
+++ b/src/lib/dns/rrtype-placeholder.h
@@ -223,7 +223,7 @@ public:
     /// \brief Same as \c equals().
     bool operator==(const RRType& other) const { return (equals(other)); }
 
-    /// \brief Return true iff two RRTypes are equal.
+    /// \brief Return true iff two RRTypes are not equal.
     ///
     /// This method never throws an exception.
     ///