diff --git a/README.md b/README.md
index dc2e13b..fe0c848 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,6 @@ Examples:
 
 I've been using `vercel` for local dev. To load up a local server: `vercel dev`.
 
-Note that this version creates a distribution from the 90th percentile on the contributions per day to stop the odd _really_ big days blowing out the scale. It also has a default minimum for non-zero contribition days (10% of the maximum height)
+Note that this version creates a distribution from the 99th percentile on the contributions per day to stop the odd _really_ big days blowing out the scale. It also has a default minimum for non-zero contribition days (10% of the maximum height)
 
 
diff --git a/js/contributions.js b/js/contributions.js
index 055c67b..ac72910 100644
--- a/js/contributions.js
+++ b/js/contributions.js
@@ -207,11 +207,11 @@ const init = () => {
       if (day.count === json.min)
       {
         height = MAX_HEIGHT * 0.1
-      } else if (day.count > json.min && day.count <= json.p90)
+      } else if (day.count > json.min && day.count <= json.p99)
       {
-        height = ((MAX_HEIGHT * 0.1) + (((MAX_HEIGHT * 0.8) / json.p90) * day.count)).toFixed(4)
+        height = ((MAX_HEIGHT * 0.1) + (((MAX_HEIGHT * 0.8) / json.p99) * day.count)).toFixed(4)
       }
-      else if (day.count > json.p90)
+      else if (day.count > json.p99)
       {
         height = ((MAX_HEIGHT * 0.9) + (((MAX_HEIGHT * 0.1) / json.max) * day.count)).toFixed(4)
       }