diff --git a/data/pref.xml b/data/pref.xml
index cc8c0c94d..3cd2a70f1 100644
--- a/data/pref.xml
+++ b/data/pref.xml
@@ -18,11 +18,6 @@
       <value id="MERGE" value="0" />
       <value id="RED_BLUE_TINT" value="1" />
     </enum>
-    <enum id="AniDir">
-      <value id="FORWARD" value="0" />
-      <value id="REVERSE" value="1" />
-      <value id="PING_PONG" value="2" />
-    </enum>
     <enum id="FreehandAlgorithm">
       <value id="REGULAR" value="0" />
       <value id="PIXEL_PERFECT" value="1" />
@@ -137,7 +132,7 @@
       <option id="visible" type="bool" default="false" />
       <option id="from" type="doc::frame_t" default="0" />
       <option id="to" type="doc::frame_t" default="1" />
-      <option id="ani_dir" type="AniDir" default="AniDir::FORWARD" />
+      <option id="ani_dir" type="doc::AniDir" default="doc::AniDir::FORWARD" />
     </section>
   </document>
 
diff --git a/docs/files/ase.txt b/docs/files/ase.txt
index 366eea432..a16bae2fa 100644
--- a/docs/files/ase.txt
+++ b/docs/files/ase.txt
@@ -231,10 +231,17 @@ Frame Tags Chunk (0x2018)
 ----------------------------------------
 
   WORD          Number of tags
+  BYTE[8]       For future (set to zero)
   + For each tag
     WORD        From frame
     WORD        To frame
+    BYTE        Loop animation direction
+                0 - Forward
+                1 - Reverse
+                2 - Ping-pong
+    BYTE[8]     For future (set to zero)
     BYTE[3]     RGB values of the tag color
+    BYTE        Extra byte (zero)
     STRING      Tag name
 
 
diff --git a/src/app/file/ase_format.cpp b/src/app/file/ase_format.cpp
index 4c576d653..df6fb6522 100644
--- a/src/app/file/ase_format.cpp
+++ b/src/app/file/ase_format.cpp
@@ -1277,12 +1277,23 @@ static void ase_file_write_mask_chunk(FILE* f, ASE_FrameHeader* frame_header, Ma
 static void ase_file_read_frame_tags_chunk(FILE* f, FrameTags* frameTags)
 {
   size_t tags = fgetw(f);
+
+  fgetl(f);                     // 8 reserved bytes
+  fgetl(f);
+
   for (size_t c=0; c<tags; ++c) {
     frame_t from = fgetw(f);
     frame_t to = fgetw(f);
+    int aniDir = fgetc(f);
+
+    fgetl(f);                     // 8 reserved bytes
+    fgetl(f);
+
     int r = fgetc(f);
     int g = fgetc(f);
     int b = fgetc(f);
+    fgetc(f);                     // Skip
+
     std::string name = ase_file_read_string(f);
 
     FrameTag* tag = new FrameTag(from, to);
@@ -1297,12 +1308,23 @@ static void ase_file_write_frame_tags_chunk(FILE* f, ASE_FrameHeader* frame_head
   ChunkWriter chunk(f, frame_header, ASE_FILE_CHUNK_FRAME_TAGS);
 
   fputw(frameTags->size(), f);
+
+  fputl(0, f);  // 8 reserved bytes
+  fputl(0, f);
+
   for (FrameTag* tag : *frameTags) {
     fputw(tag->fromFrame(), f);
     fputw(tag->toFrame(), f);
+    fputc((int)tag->aniDir(), f);
+
+    fputl(0, f);  // 8 reserved bytes
+    fputl(0, f);
+
     fputc(doc::rgba_getr(tag->color()), f);
     fputc(doc::rgba_getg(tag->color()), f);
     fputc(doc::rgba_getb(tag->color()), f);
+    fputc(0, f);
+
     ase_file_write_string(f, tag->name().c_str());
   }
 }
diff --git a/src/app/handle_anidir.cpp b/src/app/handle_anidir.cpp
index c7c4f5888..5c320014d 100644
--- a/src/app/handle_anidir.cpp
+++ b/src/app/handle_anidir.cpp
@@ -37,19 +37,19 @@ doc::frame_t calculate_next_frame(
 
   switch (docPref.loop.aniDir()) {
 
-    case app::gen::AniDir::FORWARD:
+    case doc::AniDir::FORWARD:
       ++frame;
       if (frame > last)
         frame = first;
       break;
 
-    case app::gen::AniDir::REVERSE:
+    case doc::AniDir::REVERSE:
       --frame;
       if (frame < first)
         frame = last;
       break;
 
-    case app::gen::AniDir::PING_PONG:
+    case doc::AniDir::PING_PONG:
       if (pingPongForward) {
         ++frame;
         if (frame > last) {
diff --git a/src/app/ui/configure_timeline_popup.cpp b/src/app/ui/configure_timeline_popup.cpp
index 1eed6b1ad..45bd77dbf 100644
--- a/src/app/ui/configure_timeline_popup.cpp
+++ b/src/app/ui/configure_timeline_popup.cpp
@@ -61,9 +61,9 @@ ConfigureTimelinePopup::ConfigureTimelinePopup()
   m_resetOnionskin->Click.connect(Bind<void>(&ConfigureTimelinePopup::onResetOnionskin, this));
   m_setLoopSection->Click.connect(Bind<void>(&ConfigureTimelinePopup::onSetLoopSection, this));
   m_resetLoopSection->Click.connect(Bind<void>(&ConfigureTimelinePopup::onResetLoopSection, this));
-  m_normalDir->Click.connect(Bind<void>(&ConfigureTimelinePopup::onAniDir, this, app::gen::AniDir::FORWARD));
-  m_reverseDir->Click.connect(Bind<void>(&ConfigureTimelinePopup::onAniDir, this, app::gen::AniDir::REVERSE));
-  m_pingPongDir->Click.connect(Bind<void>(&ConfigureTimelinePopup::onAniDir, this, app::gen::AniDir::PING_PONG));
+  m_normalDir->Click.connect(Bind<void>(&ConfigureTimelinePopup::onAniDir, this, doc::AniDir::FORWARD));
+  m_reverseDir->Click.connect(Bind<void>(&ConfigureTimelinePopup::onAniDir, this, doc::AniDir::REVERSE));
+  m_pingPongDir->Click.connect(Bind<void>(&ConfigureTimelinePopup::onAniDir, this, doc::AniDir::PING_PONG));
 }
 
 DocumentPreferences& ConfigureTimelinePopup::docPref()
@@ -98,13 +98,13 @@ void ConfigureTimelinePopup::updateWidgetsFromCurrentSettings()
   }
 
   switch (docPref.loop.aniDir()) {
-    case app::gen::AniDir::FORWARD:
+    case doc::AniDir::FORWARD:
       m_normalDir->setSelected(true);
       break;
-    case app::gen::AniDir::REVERSE:
+    case doc::AniDir::REVERSE:
       m_reverseDir->setSelected(true);
       break;
-    case app::gen::AniDir::PING_PONG:
+    case doc::AniDir::PING_PONG:
       m_pingPongDir->setSelected(true);
       break;
   }
@@ -170,7 +170,7 @@ void ConfigureTimelinePopup::onResetLoopSection()
   docPref().loop.visible(false);
 }
 
-void ConfigureTimelinePopup::onAniDir(app::gen::AniDir aniDir)
+void ConfigureTimelinePopup::onAniDir(doc::AniDir aniDir)
 {
   docPref().loop.aniDir(aniDir);
 }
diff --git a/src/app/ui/configure_timeline_popup.h b/src/app/ui/configure_timeline_popup.h
index 7cdc325ae..6cdd421dc 100644
--- a/src/app/ui/configure_timeline_popup.h
+++ b/src/app/ui/configure_timeline_popup.h
@@ -10,6 +10,7 @@
 #pragma once
 
 #include "app/pref/preferences.h"
+#include "doc/anidir.h"
 #include "ui/popup_window.h"
 
 namespace ui {
@@ -33,7 +34,7 @@ namespace app {
     void onResetOnionskin();
     void onSetLoopSection();
     void onResetLoopSection();
-    void onAniDir(app::gen::AniDir aniDir);
+    void onAniDir(doc::AniDir aniDir);
 
   private:
     void updateWidgetsFromCurrentSettings();
diff --git a/src/doc/anidir.h b/src/doc/anidir.h
new file mode 100644
index 000000000..e459f4aea
--- /dev/null
+++ b/src/doc/anidir.h
@@ -0,0 +1,21 @@
+// Aseprite Document Library
+// Copyright (c) 2001-2015 David Capello
+//
+// This file is released under the terms of the MIT license.
+// Read LICENSE.txt for more information.
+
+#ifndef DOC_ANIDIR_H_INCLUDED
+#define DOC_ANIDIR_H_INCLUDED
+#pragma once
+
+namespace doc {
+
+  enum class AniDir {
+    FORWARD = 0,
+    REVERSE = 1,
+    PING_PONG = 2,
+  };
+
+} // namespace doc
+
+#endif // DOC_ANIDIR_H_INCLUDED
diff --git a/src/doc/frame_tag.cpp b/src/doc/frame_tag.cpp
index 8df479b00..71ce50e4a 100644
--- a/src/doc/frame_tag.cpp
+++ b/src/doc/frame_tag.cpp
@@ -37,4 +37,9 @@ void FrameTag::setColor(color_t color)
   m_color = color;
 }
 
+void FrameTag::setAniDir(AniDir aniDir)
+{
+  m_aniDir = aniDir;
+}
+
 } // namespace doc
diff --git a/src/doc/frame_tag.h b/src/doc/frame_tag.h
index 80320785c..090d81417 100644
--- a/src/doc/frame_tag.h
+++ b/src/doc/frame_tag.h
@@ -9,6 +9,7 @@
 #pragma once
 
 #include "base/disable_copying.h"
+#include "doc/anidir.h"
 #include "doc/color.h"
 #include "doc/frame.h"
 #include "doc/object.h"
@@ -25,15 +26,18 @@ namespace doc {
     frame_t toFrame() const { return m_to; }
     const std::string& name() const { return m_name; }
     color_t color() const { return m_color; }
+    AniDir aniDir() const { return m_aniDir; }
 
     void setFrameRange(frame_t from, frame_t to);
     void setName(const std::string& name);
     void setColor(color_t color);
+    void setAniDir(AniDir aniDir);
 
   public:
     frame_t m_from, m_to;
     color_t m_color;
     std::string m_name;
+    AniDir m_aniDir;
 
     DISABLE_COPYING(FrameTag);
   };
diff --git a/src/gen/pref_types.cpp b/src/gen/pref_types.cpp
index 2d6a5e900..b76fc8efe 100644
--- a/src/gen/pref_types.cpp
+++ b/src/gen/pref_types.cpp
@@ -186,6 +186,7 @@ void gen_pref_header(TiXmlDocument* doc, const std::string& inputFn)
     << "\n"
     << "#include \"app/color.h\"\n"
     << "#include \"app/pref/option.h\"\n"
+    << "#include \"doc/anidir.h\"\n"
     << "#include \"doc/frame.h\"\n"
     << "#include \"gfx/rect.h\"\n"
     << "#include \"filters/tiled_mode.h\"\n"