diff --git a/bin/ebooks b/bin/ebooks
index c564df8..9ce5a53 100755
--- a/bin/ebooks
+++ b/bin/ebooks
@@ -25,6 +25,7 @@ Usage:
      ebooks auth
      ebooks consume <corpus_path> [corpus_path2] [...]
      ebooks consume-all <model_name> <corpus_path> [corpus_path2] [...]
+     ebooks append <model_name> <corpus_path>
      ebooks gen <model_path> [input]
      ebooks archive <username> [path]
      ebooks tweet <model_path> <botname>
@@ -116,6 +117,24 @@ STR
     log "Corpuses consumed to #{outpath}"
   end
 
+  HELP.append = <<-STR
+    Usage: ebooks append <model_name> <corpus_path>
+
+    Process then append the provided corpus to the model 
+    instead of overwriting.
+  STR
+
+  def self.append(name, path)
+    if !name || !path
+      help :append
+      exit 1
+    end
+
+    Ebooks::Model.consume(path).append(File.join(APP_PATH,'model',"#{name}.model"))
+    log "Corpus appended to #{name}.model"
+  end
+ 
+
   HELP.jsonify = <<-STR
     Usage: ebooks jsonify <tweets.csv> [tweets.csv2] [...]
 
@@ -380,6 +399,7 @@ STR
     when "new" then new(args[1])
     when "consume" then consume(args[1..-1])
     when "consume-all" then consume_all(args[1], args[2..-1])
+    when "append" then append(args[1],args[2])
     when "gen" then gen(args[1], args[2..-1].join(' '))
     when "archive" then archive(args[1], args[2])
     when "tweet" then tweet(args[1], args[2])
diff --git a/lib/twitter_ebooks/model.rb b/lib/twitter_ebooks/model.rb
index 8849118..a40b046 100644
--- a/lib/twitter_ebooks/model.rb
+++ b/lib/twitter_ebooks/model.rb
@@ -69,6 +69,35 @@ module Ebooks
       self
     end
 
+    # Append a generated model to existing model file instead of overwriting it
+    # @param path [String]
+    def append(path)
+      existing = File.file?(path)
+      if !existing
+        log "No existing model found at #{path}"
+        return
+      else
+        #read-in and deserialize existing model
+        props = Marshal.load(File.open(path,'rb') { |old| old.read })
+        old_tokens = props[:tokens]
+        old_sentences = props[:sentences]
+        old_mentions = props[:mentions]
+        old_keywords = props[:keywords]
+
+        #append existing properties to new ones and overwrite with new model
+        File.open(path, 'wb') do |f|
+          f.write(Marshal.dump({
+            tokens: @tokens.concat(old_tokens),
+            sentences: @sentences.concat(old_sentences),
+            mentions: @mentions.concat(old_mentions),
+            keywords: @keywords.concat(old_keywords)
+          }))
+        end
+      end
+      self
+    end
+     
+
     def initialize
       @tokens = []