Improve knowledge base

1 files changed, 3 insertions, 1 deletions

diff --git a/source/know/concept/runge-kutta-method/index.md b/source/know/concept/runge-kutta-method/index.md
index 4c3dacf..f0e54ba 100644
--- a/source/know/concept/runge-kutta-method/index.md
+++ b/source/know/concept/runge-kutta-method/index.md
@@ -88,12 +88,13 @@ since this is not a practical way to describe RKMs,
 but it is helpful to understand how they work.
 
 
+
 ## Example derivation
 
 For example, let us truncate at $$n = 3$$,
 such that $$N_1 = 3$$, $$N_2 = 3$$ and $$N_3 = 1$$.
 The following derivation is very general,
-except it requires all $$\alpha_j \neq 0$$.
+only requiring all $$\alpha_j \neq 0$$.
 Renaming $$\omega_{mj}$$, we start from:
 
 $$\begin{aligned}
@@ -177,6 +178,7 @@ there is an enormous freedom of choice here,
 all leading to valid RKMs, although not necessarily good ones.
 
 
+
 ## General form
 
 A more practical description goes as follows: