diff --git a/README.md b/README.md
index 6c6e43d..360ba8f 100644
--- a/README.md
+++ b/README.md
@@ -41,7 +41,7 @@ same leap year rules as the Gregorian calendar, i.e. every year divisible
 by four, except century years not divisible by 400. This method might make
 sense, except years 3, 7, and 11 were leap years under the original rules
 and were observed as such in real life, but the *Romme* method instead makes
-years 4, 6, 11 leap years instead.
+years 4, 8, 12 leap years instead.
 
 This version uses the original rules. The [JPL's DE440 and DE441
 ephemerides][3] were used to calculate the exact timings of the autumnal
diff --git a/public/index.html b/public/index.html
index 64b4e94..336e16a 100644
--- a/public/index.html
+++ b/public/index.html
@@ -68,7 +68,7 @@
             <p>Most versions uses the so-called <em>Romme</em> method for leap years, using the same leap year rules as
                 the Gregorian calendar, i.e. every year divisible by four, except century years not divisible by 400.
                 This method might make sense, except years 3, 7, and 11 were leap years under the original rules and
-                were observed as such in real life, but the <em>Romme</em> method instead makes years 4, 6, 11 leap
+                were observed as such in real life, but the <em>Romme</em> method instead makes years 4, 8, 12 leap
                 years instead.</p>
             <p>This version uses the original rules. The <a href="https://ssd.jpl.nasa.gov/planets/eph_export.html">JPL's
                 DE440 and DE441 ephemerides</a> were used to calculate the exact timings of the autumnal equinoxes