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-rw-r--r--content/know/concept/harmonic-oscillator/index.pdc3
1 files changed, 2 insertions, 1 deletions
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,