diff --git a/docs/README.md b/docs/README.md
index 0a951eac28..c0de47673e 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -9,4 +9,4 @@
 - Rectangle: P = 2a + 2b
 - Square: P = 4a
 
-# Some change for Lesson 6 practice
+# Some change for Lesson 6 practice xD
diff --git a/docs/README.md.save b/docs/README.md.save
new file mode 100644
index 0000000000..4caa3963ca
--- /dev/null
+++ b/docs/README.md.save
@@ -0,0 +1,13 @@
+# Math formulas
+## Area
+- Circle: S = πR²
+- Rectangle: S = ab
+- Square: S = a²
+
+## Perimeter
+- Circle: P = 2πR
+- Rectangle: P = 2a + 2b
+- Square: P = 4a
+
+# Some change for Lesson 6 practice xD
+