diff --git a/README.md b/README.md
index 79269b7e2..8de0aca54 100644
--- a/README.md
+++ b/README.md
@@ -34,7 +34,7 @@ the frequency or time domain, using the
   - Scalable algorithms for the solution of linear systems of equations, including matrix-
     free $p$-multigrid utilizing
     [high-order operator partial assembly](https://mfem.org/performance/), parallel sparse
-    direct solvers, and algebraic multigrid(AMG) preconditioners, for fast performance on
+    direct solvers, and algebraic multigrid (AMG) preconditioners, for fast performance on
     platforms ranging from laptops to HPC systems.
 
 ## Getting started
diff --git a/docs/src/reference.md b/docs/src/reference.md
index 2aebdde3d..68fa37afa 100644
--- a/docs/src/reference.md
+++ b/docs/src/reference.md
@@ -352,7 +352,7 @@ for interface ``j`` is given by
 ```math
 \frac{1}{Q^{MS}_j} =
     \frac{1}{\mathcal{E}^{elec}} \, \frac{1}{2} \,
-    \frac{t_j\tan{\delta}_j(\varepsilon_{r,j}^{S})^2}{\varepsilon_{r,j}^{MA}} \,
+    \frac{t_j\tan{\delta}_j(\varepsilon_{r,j}^{S})^2}{\varepsilon_{r,j}^{MS}} \,
     \text{Re}\left\{\int_{\Gamma_j}\bm{E}_n^*\cdot\bm{E}_n\,dS\right\}
 ```