diff --git a/README.md b/README.md
index 179a83f5..1c504263 100644
--- a/README.md
+++ b/README.md
@@ -63,7 +63,8 @@ Credits
 
 Developed by [Omar Cornut](http://www.miracleworld.net). The library was developed with the support of [Media Molecule](http://www.mediamolecule.com) and first used internally on the game [Tearaway](http://tearaway.mediamolecule.com). 
 
-Embeds [proggy_clean](http://upperbounds.net) font by Tristan Grimmer (also MIT license).
+Embeds [proggy_clean](http://upperbounds.net) font by Tristan Grimmer (MIT license).
+Embeds [M+ fonts](http://mplus-fonts.sourceforge.jp/mplus-outline-fonts/index-en.html) font by Coji Morishita (free software license).
 
 Inspiration, feedback, and testing: Casey Muratori, Atman Binstock, Mikko Mononen, Emmanuel Briney, Stefan Kamoda, Anton Mikhailov, Matt Willis. Thanks!
 
diff --git a/extra_fonts/README.txt b/extra_fonts/README.txt
index 6acb278d..8204d4e0 100644
--- a/extra_fonts/README.txt
+++ b/extra_fonts/README.txt
@@ -10,12 +10,22 @@ bmfont reads fonts (.ttf, .fon, etc.) and output a .fnt file and a texture file,
   proggy_clean.fon --> [bmfont] ---> proggy_clean_13.fnt
                                      proggy_clean_13.png
 
+If you need a free font that supports chinese/japanese characters, you can use the M+ fonts.
+TTF and sources are availables at http://mplus-fonts.sourceforge.jp/mplus-outline-fonts.
+This directory include some of the M+ fonts converted by bmfont.
+
+//-----------------------------------------------------------------------------
+
 Configure bmfont:
 
   - Export .fnt as Binary
+  - Output .png, 32-bits (or whatever is suitable for your loader/renderer)
   - Tip: uncheck "Render from TrueType outline" and "Font Smoothing" for best result with non-anti-aliased type fonts. 
     But you can experiment with other settings if you want anti-aliased fonts.
+  - Tip: use pngout.exe (http://advsys.net/ken/utils.htm) to further reduce the file size of .png files
+    All files in this folder have been optimised with pngout.exe
 
+-----------------------------------------------------------------------------
 
 (A) Use font data embedded in ImGui
 
@@ -34,28 +44,45 @@ Configure bmfont:
     
   2. Load the .PNG data from 'png_data' into a texture
 
-
+//-----------------------------------------------------------------------------
 
 (B) Use fonts from external files
 
-    ImGuiIO& io = ImGui::GetIO();
+  You need to set io.FontTexUvForWhite to UV coordinates pointing to a white pixel in the texture.
+  You can either locate a white pixel manually or use code at runtime to find or write one.
+  The OpenGL example include sample code to find a white pixel given an uncompressed 32-bits texture:
+
+  	  // Automatically find white pixel from the texture we just loaded
+	  // (io.FontTexUvForWhite needs to contains UV coordinates pointing to a white pixel in order to render solid objects)
+	  for (int tex_data_off = 0; tex_data_off < tex_x*tex_y; tex_data_off++)
+	      if (((unsigned int*)tex_data)[tex_data_off] == 0xffffffff)
+	      {
+	          io.FontTexUvForWhite = ImVec2((float)(tex_data_off % tex_x)/(tex_x), (float)(tex_data_off / tex_x)/(tex_y));
+	          break;
+	      }
 
   1. Load the .FNT data, e.g.
+
+    ImGuiIO& io = ImGui::GetIO();
     
     // proggy_clean_13 [default]
+    io.Font = new ImBitmapFont();
     io.Font->LoadFromFile("proggy_clean_13.fnt");
+    IM_ASSERT(io.Font->IsLoaded());
     io.FontTexUvForWhite = ImVec2(0.0f/256.0f,0.0f/128);
     io.FontYOffset = +1;
 
     // proggy_small_12
     io.Font = new ImBitmapFont();
     io.Font->LoadFromFile("proggy_small_12.fnt");
+    IM_ASSERT(io.Font->IsLoaded());
     io.FontTexUvForWhite = ImVec2(84.0f/256.0f,20.0f/64);
     io.FontYOffset = +2;
     
     // proggy_small_14
     io.Font = new ImBitmapFont();
     io.Font->LoadFromFile("proggy_small_14.fnt");
+    IM_ASSERT(io.Font->IsLoaded());
     io.FontTexUvForWhite = ImVec2(84.0f/256.0f,20.0f/64);
     io.FontYOffset = +3;
     
@@ -67,5 +94,7 @@ Configure bmfont:
     io.Font->LoadFromFile("courier_new_18.fnt");
     io.FontTexUvForWhite = ImVec2(4.0f/256.0f,5.0f/256);
 
+
   2. Load the matching .PNG data into a texture
 
+//-----------------------------------------------------------------------------
diff --git a/imgui.cpp b/imgui.cpp
index 3609a419..7dd49f34 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -1,4 +1,4 @@
-// ImGui library v1.12+
+// ImGui library v1.13
 // See ImGui::ShowTestWindow() for sample code.
 // Read 'Programmer guide' below for notes on how to setup ImGui in your codebase.
 // Get latest version at https://github.com/ocornut/imgui
@@ -22,7 +22,6 @@
  Designed for developers and content-creators, not the typical end-user! Some of the weaknesses includes:
  - doesn't look fancy, doesn't animate
  - limited layout features, intricate layouts are typically crafted in code
- - assume ASCII text, using strlen() and [] operators, etc
  - occasionally use statically sized buffers for string manipulations - won't crash, but some long text may be clipped
  
  END-USER GUIDE
diff --git a/imgui.h b/imgui.h
index e8b76b5f..5e701ed6 100644
--- a/imgui.h
+++ b/imgui.h
@@ -1,4 +1,4 @@
-// ImGui library v1.12+
+// ImGui library v1.13
 // See .cpp file for commentary.
 // See ImGui::ShowTestWindow() for sample code.
 // Read 'Programmer guide' in .cpp for notes on how to setup ImGui in your codebase.