diff --git a/lib/net/imap/esearch_result.rb b/lib/net/imap/esearch_result.rb
index f0c25695..68c94ec5 100644
--- a/lib/net/imap/esearch_result.rb
+++ b/lib/net/imap/esearch_result.rb
@@ -25,6 +25,12 @@ class IMAP
     # Some search extensions may result in the server sending ESearchResult
     # responses after the initiating command has completed.  Use
     # IMAP#add_response_handler to handle these responses.
+    #
+    # ==== Compatibility with SearchResult
+    #
+    # Note that both SearchResult and ESearchResult implement +each+, +to_a+,
+    # and +to_sequence_set+.  These methods can be used regardless of whether
+    # the server returns +SEARCH+ or +ESEARCH+ data (or no data).
     class ESearchResult < Data.define(:tag, :uid, :data)
       def initialize(tag: nil, uid: nil, data: nil)
         tag  => String       | nil; tag = -tag if tag
diff --git a/lib/net/imap/search_result.rb b/lib/net/imap/search_result.rb
index 31f127b3..80cb62de 100644
--- a/lib/net/imap/search_result.rb
+++ b/lib/net/imap/search_result.rb
@@ -7,6 +7,12 @@ class IMAP
     # identifiers returned by Net::IMAP#uid_search.
     #
     # For backward compatibility, SearchResult inherits from Array.
+    #
+    # ==== Compatibility with ESearchResult
+    #
+    # Note that both SearchResult and ESearchResult implement +each+, +to_a+,
+    # and +to_sequence_set+.  These methods can be used regardless of whether
+    # the server returns +SEARCH+ or +ESEARCH+ data (or no data).
     class SearchResult < Array
 
       # Returns a SearchResult populated with the given +seq_nums+.