diff --git a/academic/avogadroapp/README b/academic/avogadroapp/README
index dff2a31cc7..692ec7f1c2 100644
--- a/academic/avogadroapp/README
+++ b/academic/avogadroapp/README
@@ -18,6 +18,6 @@ Warning: the computational settings made through the Input Generator
 require the MoleQueue server running to submit jobs to local
 applications or remote HPC clusters.
 
-OPTIONAL:
-
-hdf5 for a static build.
+Since Avogadro 2 version 1.98.0, the build requires cmake at version
+3.24 or greater. This version is the latest compatible with Slackware
+15.0 that has cmake remained at the version 3.21.