diff --git a/education/statistics/Correlation and Regression.md b/education/statistics/Correlation and Regression.md
index 1403707..432b3fa 100644
--- a/education/statistics/Correlation and Regression.md	
+++ b/education/statistics/Correlation and Regression.md	
@@ -58,4 +58,5 @@ https://www.thoughtco.com/how-to-calculate-the-correlation-coefficient-3126228
 - $r$ is not a linear, perfect scale. An $r$ of 0.8 does not mean twice as much linearity as an $r$ of 0.4
 ### Ecological Correlations
 - Sometimes each point on the plot represents the average or rate for a whole group of individuals. 
-- Ecological correlations are artificially strong
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+- Ecological correlations are artificially strong
+- The size of points may indicate the size of the datapoints
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