diff --git a/docs/Doxyfile.in b/docs/Doxyfile.in
index 56a877c..50b2997 100644
--- a/docs/Doxyfile.in
+++ b/docs/Doxyfile.in
@@ -697,7 +697,7 @@ SORT_MEMBERS_CTORS_1ST = NO
 # appear in their defined order.
 # The default value is: NO.
 
-SORT_GROUP_NAMES       = NO
+SORT_GROUP_NAMES       = YES
 
 # If the SORT_BY_SCOPE_NAME tag is set to YES, the class list will be sorted by
 # fully-qualified names, including namespaces. If set to NO, the class list will