From e5f44d97c6652f262c82b5c796c07a7a22a00e90 Mon Sep 17 00:00:00 2001
From: Prefetch
Date: Sun, 4 Jul 2021 20:02:27 +0200
Subject: Expand knowledge base

---
 content/know/concept/harmonic-oscillator/index.pdc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'content/know/concept/harmonic-oscillator/index.pdc')

diff --git a/content/know/concept/harmonic-oscillator/index.pdc b/content/know/concept/harmonic-oscillator/index.pdc
index 5d97a24..4219602 100644
--- a/content/know/concept/harmonic-oscillator/index.pdc
+++ b/content/know/concept/harmonic-oscillator/index.pdc
@@ -68,7 +68,8 @@ $$\begin{aligned}
     x(t) = \cos\!(\omega_0 t)
 \end{aligned}$$
 
-When using Lagrangian mechanics or Hamiltonian mechanics,
+When using [Lagrangian](/know/concept/lagrangian-mechanics/)
+or Hamiltonian mechanics,
 we need to know the potential energy $V(x)$
 added to the system by a displacement to $x$.
 This equals the work done by the displacement,
-- 
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