diff --git a/README.md b/README.md
index 342f963..50e7bde 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ expressions:
 $$
 \mathbf{Y} = \mathbb{KLT}\{\mathbf{X}\},
 C = \frac{1}{n-1}\mathbf{X}*\mathbf{X},
-\mathbf{V}^{-1}\matbf{C}\mathbf{V} = \mathbf{D},
+\mathbf{V}^{-1}\mathbf{C}\mathbf{V} = \mathbf{D},
 \mathit{W} \subset \mathit{V},
 T = \mathbf{B} \cdot \mathbf{W}.
 $$
@@ -20,5 +20,8 @@ $\mathit{W}$ which is a subset of eigenvectors, explicitly or intuitively
 selected. Matrix $\mathbf{T}$ is the newly reduced data with an explained
 variance ratio $\lt1.0$, though typically very high.
 
+For further information, or if the $\LaTeX$ does not render properly or in full,
+see [Principal Component Analysis](https://en.wikipedia.org/wiki/Principal_component_analysis#Computation_using_the_covariance_method)
+
 The source code is built entirely on the GNU GSL (2.7) library, to
 utilise BLAS optimised functionality.