diff --git a/vignettes/orthus.Rmd b/vignettes/orthus.Rmd
index 4b664af..fc8cbe2 100644
--- a/vignettes/orthus.Rmd
+++ b/vignettes/orthus.Rmd
@@ -134,7 +134,7 @@ state that our mean for $\Lambda$ is centered about $\mathbf{0}$ and that the si
 
 ```{r}
 Gamma <- diag(Q)
-Theta <- matrix(0, D-1+P, 1)
+Theta <- matrix(0, D-1+P, Q)
 ```
 
 
@@ -226,4 +226,4 @@ and taxa you really care about and if you can, isolate your analyses to those.
 Alright, that's probably enough philosophizing for an R package Vignette. I hope you enjoy
 *orthus*. 
 
-# References
\ No newline at end of file
+# References