diff --git a/.gitmodules b/.gitmodules
index 2fd3c13..dde613f 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -15,3 +15,7 @@
 	path = Tesseract Green
 	url = https://gitlab.com/tesseract-prebuilt/tesseract-green.git
 	ignore = dirty
+[submodule "Tesseract Open Source OCR Engine (main repository)"]
+	path = Tesseract Open Source OCR Engine (main repository)
+	url = https://github.com/tesseract-ocr/tesseract.git
+	ignore = dirty
diff --git a/README.md b/README.md
index 9fa9958..d40ac69 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,8 @@
 
 ## 解決方案
 
+* [Tesseract Open Source OCR Engine (main repository)](https://github.com/tesseract-ocr/tesseract)  
+  上游專案
 * [Tesseract Green](https://gitlab.com/tesseract-prebuilt/tesseract-green)  
   An Ansible role for building dependency bundled, ready-to-use Tesseract packages
 * （開發中）[Tesseract Orange](https://gitlab.com/tesseract-prebuilt/tesseract-orange)  
diff --git a/Tesseract Open Source OCR Engine (main repository) b/Tesseract Open Source OCR Engine (main repository)
new file mode 160000
index 0000000..8ee020e
--- /dev/null
+++ b/Tesseract Open Source OCR Engine (main repository)	
@@ -0,0 +1 @@
+Subproject commit 8ee020e14cf5be4e3f0e9beb09b6b050a1871854