diff --git a/doc/src/dihedral_multi_harmonic.rst b/doc/src/dihedral_multi_harmonic.rst
index 5f6f840d61..3656ad814a 100644
--- a/doc/src/dihedral_multi_harmonic.rst
+++ b/doc/src/dihedral_multi_harmonic.rst
@@ -1,4 +1,5 @@
 .. index:: dihedral_style multi/harmonic
+.. index:: dihedral_style multi/harmonic/kk
 .. index:: dihedral_style multi/harmonic/omp
 
 dihedral_style multi/harmonic command