diff --git a/lib/twitter_ebooks/bot.rb b/lib/twitter_ebooks/bot.rb
index 568f06c..ed03229 100644
--- a/lib/twitter_ebooks/bot.rb
+++ b/lib/twitter_ebooks/bot.rb
@@ -40,8 +40,8 @@ module Ebooks
     # Figure out whether to keep this user in the reply prefix
     # We want to avoid spamming non-participating users
     def can_include?(username)
-      @tweets.length <= 4 ||
-        !@tweets[-4..-1].select { |t| t.user.screen_name.downcase == username.downcase }.empty?
+      @tweets.length <= 6 ||
+        !@tweets[-6..-1].select { |t| t.user.screen_name.downcase == username.downcase }.empty?
     end
   end
 
diff --git a/lib/twitter_ebooks/model.rb b/lib/twitter_ebooks/model.rb
index 666f78c..7213d79 100644
--- a/lib/twitter_ebooks/model.rb
+++ b/lib/twitter_ebooks/model.rb
@@ -208,7 +208,7 @@ module Ebooks
     # Generate some text
     # @param limit [Integer] available characters
     # @param generator [SuffixGenerator, nil]
-    # @param retry_limit [Integer] how many times to retry on duplicates
+    # @param retry_limit [Integer] how many times to retry on invalid tweet
     # @return [String]
     def make_statement(limit=140, generator=nil, retry_limit=10)
       responding = !generator.nil?