diff --git a/doc/RTD/source/SubgridModels/EAGLE/index.rst b/doc/RTD/source/SubgridModels/EAGLE/index.rst
index cac6716c7568b7c7d2168a77586cc80123df7127..ba0f62b4d77634707a36cc41d691609dffa23ce5 100644
--- a/doc/RTD/source/SubgridModels/EAGLE/index.rst
+++ b/doc/RTD/source/SubgridModels/EAGLE/index.rst
@@ -238,6 +238,13 @@ Whilst one would use the following values for solar abundances
      init_abundance_Silicon:      6.825874e-4  # Mass fraction in Silicon
      init_abundance_Iron:         1.1032152e-3 # Mass fraction in Iron
 
+Note that the code will verify that the input values make broad sense. This
+means that SWIFT checks on startup that:
+
+ * :math:`Z_{\rm H}+Z_{\rm He}+Z_{\rm metals} \approx 1`
+ * :math:`Z_{\rm C} + Z_{\rm N} + Z_{\rm O} + Z_{\rm Ne} + Z_{\rm Mg} + Z_{\rm Si} + Z_{\rm Fe} \lesssim Z_{\rm metals}`
+ * :math:`Z_{\rm H} + Z_{\rm He} + Z_{\rm C} + Z_{\rm N} + Z_{\rm O} + Z_{\rm Ne} + Z_{\rm Mg} + Z_{\rm Si} + Z_{\rm Fe} \approx 1`
+
 Individual element abundances for each particle can also be read
 directly from the ICs. By default these are overwritten in the code by
 the values read from the YAML file. However, users can set the