From d1716ab969ffa5c05707599473ece5d23094cdc7 Mon Sep 17 00:00:00 2001
From: Jukka Aho <ahojukka5@gmail.com>
Date: Sat, 9 May 2026 18:15:45 +0300
Subject: [PATCH] docs(physics): cross-link strain extraction helpers

Note that `extract_strain` consumes an existing displacement gradient, with
`compute_strain` covering the assembly path from nodal DOFs.
---
 src/physics/strain.jl | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/physics/strain.jl b/src/physics/strain.jl
index 8d8ce0e..c6615c1 100644
--- a/src/physics/strain.jl
+++ b/src/physics/strain.jl
@@ -25,6 +25,9 @@ Extract strain tensor from displacement gradient.
 # Returns
 - `ε`: Strain tensor (symmetric)
 
+See also [`compute_strain`](@ref), which first assembles `∇u` from nodal
+values and physical basis derivatives.
+
 # Examples
 ```julia
 ∇u = Tensor{2,3}((1.0, 0.1, 0.0, 0.1, 1.0, 0.0, 0.0, 0.0, 1.0))