diff --git a/docs/lessons/charting/acceleration-challenge.md b/docs/lessons/charting/acceleration-challenge.md
index 940cb3dc..8e9d8f3a 100644
--- a/docs/lessons/charting/acceleration-challenge.md
+++ b/docs/lessons/charting/acceleration-challenge.md
@@ -1,4 +1,4 @@
-# Charting Acceleration: Challenge 
+# Chart Acceleration: Challenge 
 
 ### ~avatar avatar 
 
diff --git a/docs/lessons/charting/acceleration.md b/docs/lessons/charting/acceleration.md
index 05ca4d5c..b1b0d22f 100644
--- a/docs/lessons/charting/acceleration.md
+++ b/docs/lessons/charting/acceleration.md
@@ -1,4 +1,4 @@
-# Charting Acceleration: Activity 
+# Chart Acceleration: Activity 
 
 Measure the acceleration on the micro:bit in the "x" direction.