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-rw-r--r--source/know/concept/lagrange-multiplier/index.md2
1 files changed, 1 insertions, 1 deletions
diff --git a/source/know/concept/lagrange-multiplier/index.md b/source/know/concept/lagrange-multiplier/index.md
index ce5418f..9fb61a8 100644
--- a/source/know/concept/lagrange-multiplier/index.md
+++ b/source/know/concept/lagrange-multiplier/index.md
@@ -102,7 +102,7 @@ by demanding it is stationary:
$$\begin{aligned}
0
- = \nabla \mathcal{L}
+ = \nabla' \mathcal{L}
&= \bigg( \pdv{\mathcal{L}}{x}, \pdv{\mathcal{L}}{y}, \pdv{\mathcal{L}}{\lambda} \bigg)
\\
&= \bigg( \pdv{f}{x} + \lambda \pdv{g}{x}, \:\:\: \pdv{f}{y} + \lambda \pdv{g}{y}, \:\:\: g \bigg)