From 56c6dd9575c798b6ff349030217bcf6c77b1d383 Mon Sep 17 00:00:00 2001
From: Tomas Chor <tomaschor@gmail.com>
Date: Thu, 20 Jun 2024 09:36:41 -0700
Subject: [PATCH] fix small typo in docs (#3623)

---
 docs/src/physics/hydrostatic_free_surface_model.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/src/physics/hydrostatic_free_surface_model.md b/docs/src/physics/hydrostatic_free_surface_model.md
index c4a5bcf623..dd0d14c572 100644
--- a/docs/src/physics/hydrostatic_free_surface_model.md
+++ b/docs/src/physics/hydrostatic_free_surface_model.md
@@ -13,7 +13,7 @@ user.
 
 The mass conservation equation is
 ```math
-    0 = \boldsymbol{\nabla} \boldsymbol{\cdot} \boldsymbol{u} + \partial_z w \, .  
+    0 = \boldsymbol{\nabla}_h \boldsymbol{\cdot} \boldsymbol{u} + \partial_z w \, .  
 ```
 
 Given the horizontal flow ``\boldsymbol{u}`` we use the above to diagnose the vertical velocity ``w``.