diff --git a/apachesolr.install b/apachesolr.install
index 8ef8d30..3d730c8 100644
--- a/apachesolr.install
+++ b/apachesolr.install
@@ -404,6 +404,9 @@ function apachesolr_update_7005() {
   }
 }
 
+/**
+ * Remove facet-related variable deprecated by the Facet API integration.
+ */
 function apachesolr_update_7006() {
   variable_del('apachesolr_facetstyle');
 }