From d1daef28a94620e844080d44f76f98e21a548a6c Mon Sep 17 00:00:00 2001
From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Thu, 16 Mar 2023 11:56:53 -0600
Subject: [PATCH] Add a link to the documentation.

---
 doc/doxygen/headers/vector_valued.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/doc/doxygen/headers/vector_valued.h b/doc/doxygen/headers/vector_valued.h
index fd1ad5a735..33c4387f53 100644
--- a/doc/doxygen/headers/vector_valued.h
+++ b/doc/doxygen/headers/vector_valued.h
@@ -85,7 +85,8 @@
  * Here, <b>D</b> denotes the symmetric gradient defined by
  * $\mathbf Du = \tfrac12 (\nabla \mathbf u + (\nabla \mathbf u)^T)$
  * and the colon indicates double contraction of two tensors of rank 2
- * (the Frobenius inner product). This bilinear form looks indeed very
+ * (the [Frobenius inner product](https://en.wikipedia.org/wiki/Frobenius_inner_product)).
+ * This bilinear form looks indeed very
  * much like the bilinear form of the Poisson problem in step-3. The
  * only differences are
  * <ol>
-- 
2.39.5