diff --git a/doc/Section_intro.html b/doc/Section_intro.html
index db64d2821a..065b5b5547 100644
--- a/doc/Section_intro.html
+++ b/doc/Section_intro.html
@@ -246,6 +246,7 @@ molecular dynamics options:
 <LI><A HREF = "fix_imd.html">real-time visualization and interactive MD</A>
 <LI><A HREF = "fix_atc.html">atom-to-continuum coupling</A> with finite elements
 <LI>coupled rigid body integration via the <A HREF = "fix_poems.html">POEMS</A> library
+<LI><A HREF = "doc/fix_gcmc.html">grand canonical Monte Carlo</A> insertions/deletions
 <LI><A HREF = "pair_dsmc.html">Direct Simulation Monte Carlo</A> for low-density fluids
 <LI><A HREF = "pair_peri.html">Peridynamics mesoscale modeling</A>
 <LI><A HREF = "fix_tmd.html">targeted</A> and <A HREF = "fix_smd.html">steered</A> molecular dynamics
diff --git a/doc/Section_intro.txt b/doc/Section_intro.txt
index 28c9a1a9d9..3c570b18ab 100644
--- a/doc/Section_intro.txt
+++ b/doc/Section_intro.txt
@@ -242,6 +242,7 @@ molecular dynamics options:
 "real-time visualization and interactive MD"_fix_imd.html
 "atom-to-continuum coupling"_fix_atc.html with finite elements
 coupled rigid body integration via the "POEMS"_fix_poems.html library
+"grand canonical Monte Carlo"_doc/fix_gcmc.html insertions/deletions
 "Direct Simulation Monte Carlo"_pair_dsmc.html for low-density fluids
 "Peridynamics mesoscale modeling"_pair_peri.html
 "targeted"_fix_tmd.html and "steered"_fix_smd.html molecular dynamics