diff --git a/src/Book.txt b/src/Book.txt
index 185ab98..72fe018 100644
--- a/src/Book.txt
+++ b/src/Book.txt
@@ -1,5 +1,5 @@
-chapters/chapter_1.md
-chapters/chapter_2.md
-chapters/chapter_3.md
-chapters/chapter_4.md
-chapters/chapter_5.md
\ No newline at end of file
+chapters/chapter_1.src
+chapters/chapter_2.src
+chapters/chapter_3.src
+chapters/chapter_4.src
+chapters/chapter_5.src
\ No newline at end of file
diff --git a/src/Sample.txt b/src/Sample.txt
index 04702e5..8ca5c2d 100644
--- a/src/Sample.txt
+++ b/src/Sample.txt
@@ -1 +1 @@
-chapters/chapter_1.md
+chapters/chapter_1.src
diff --git a/src/chapters/chapter_1.md b/src/chapters/chapter_1.src
similarity index 100%
rename from src/chapters/chapter_1.md
rename to src/chapters/chapter_1.src
diff --git a/src/chapters/chapter_2.md b/src/chapters/chapter_2.src
similarity index 100%
rename from src/chapters/chapter_2.md
rename to src/chapters/chapter_2.src
diff --git a/src/chapters/chapter_3.md b/src/chapters/chapter_3.src
similarity index 100%
rename from src/chapters/chapter_3.md
rename to src/chapters/chapter_3.src
diff --git a/src/chapters/chapter_4.md b/src/chapters/chapter_4.src
similarity index 100%
rename from src/chapters/chapter_4.md
rename to src/chapters/chapter_4.src
diff --git a/src/chapters/chapter_5.md b/src/chapters/chapter_5.src
similarity index 100%
rename from src/chapters/chapter_5.md
rename to src/chapters/chapter_5.src