diff --git a/lectures/simple_linear_regression.md b/lectures/simple_linear_regression.md
index 137d4539..ff8c32f8 100644
--- a/lectures/simple_linear_regression.md
+++ b/lectures/simple_linear_regression.md
@@ -68,7 +68,7 @@ ax = df.plot(
     y='Y', 
     kind='scatter', 
     ylabel='Ice-cream sales ($\'s)', 
-    xlabel='Degrees celcius'
+    xlabel='Degrees Celsius'
 )
 ```