diff --git a/configurations/home-assistant/configuration.yaml b/configurations/home-assistant/configuration.yaml
index 1d0eb95..222e0e4 100644
--- a/configurations/home-assistant/configuration.yaml
+++ b/configurations/home-assistant/configuration.yaml
@@ -75,7 +75,7 @@ template:
           {% set radius = diameter / 2 %}
           {% set height = states('sensor.cistern_water_height') | float(0) %}
           {% set volume_mm3 = 3.14159265 * (radius ** 2) * height %}
-          {{ (volume_cm3 / 1000000) | round(1) }}   {# convert mm³ to liters #}
+          {{ (volume_mm3 / 1000000) | round(1) }}   {# convert mm³ to liters #}
 
       - name: "Cistern Fill Percentage"
         unique_id: cistern_fill_percentage