diff --git a/.gitignore b/.gitignore
index 3bf579e..081e858 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 plastex/
 gerby-website/
+plastex-venv/
 document/*
 *.swp
 tags
diff --git a/src/fa/rs/rs.tex b/src/fa/rs/rs.tex
index 5cc54a4..ec98123 100644
--- a/src/fa/rs/rs.tex
+++ b/src/fa/rs/rs.tex
@@ -18,7 +18,7 @@
 
     Let $f: [a, b] \to E_2$, then $f$ is \textbf{Riemann-Stieltjes integrable} with respect to $G$ if the limit
     \[
-    \int_a^b f dG = \int_a^b f(t)dG(t) = \lim_{(P, c) \in \scp_t([a, b])}S(P, c, f, G)
+    \int_a^b f dG = \int_a^b f(t)G(dt) = \lim_{(P, c) \in \scp_t([a, b])}S(P, c, f, G)
     \]
     exists. In which case, $\int_a^b fdG$ is the \textbf{Riemann-Stieltjes integral} of $G$.