Improve knowledge baseHEADmaster

1 files changed, 1 insertions, 1 deletions

diff --git a/source/know/concept/korteweg-de-vries-equation/index.md b/source/know/concept/korteweg-de-vries-equation/index.md
index e8035d1..13b1ee2 100644
--- a/source/know/concept/korteweg-de-vries-equation/index.md
+++ b/source/know/concept/korteweg-de-vries-equation/index.md
@@ -152,7 +152,7 @@ rather than transform the coordinate system,
 the velocity is incorporated into his ansatz for $$f$$;
 in other words, he assumed that the entire liquid is moving at $$q_0$$.
 For a wave going in the positive $$x$$-direction,
-the linearized problem then predicts a profile $$\eta(x \!-\! (\sqrt{g h} \!+\! q_0))$$,
+the linearized problem then predicts a profile $$\eta(x \!-\! (\sqrt{g h} \!+\! q_0) t)$$,
 so de Vries chose $$q_0 = -\sqrt{g h}$$ to make it stationary.
 Analogously, $$q_0 = \sqrt{g h}$$ for a backward-moving wave.
 With this in mind, the ansatz is: