diff --git a/journal/Readme.md b/journal/Readme.md
index 06f5d5f00c6629bb72d6f72ba92921c94b663333..ee167450c47f5478405f0b1e8c5596b90d070939 100644
--- a/journal/Readme.md
+++ b/journal/Readme.md
@@ -2,5 +2,5 @@
 
 
 # Part 2： Critical examination of a data analysis 
-## 1. About Calculating $\pi$
+## 1. About Calculating π
 My computer tells me that $\pi$ is approximately
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