diff --git a/.local/bin/opout b/.local/bin/opout
index d5d8dffb..f391b99b 100755
--- a/.local/bin/opout
+++ b/.local/bin/opout
@@ -7,7 +7,7 @@
 basename="$(echo "$1" | sed 's/\.[^\/.]*$//')"
 
 case "$1" in
-	*.tex|*.md|*.rmd|*.ms|*.me|*.mom) setsid "$READER" "$basename".pdf >/dev/null 2>&1 & ;;
+	*.tex|*.md|*.Rmd|*.rmd|*.ms|*.me|*.mom) setsid "$READER" "$basename".pdf >/dev/null 2>&1 & ;;
 	*.[0-9]) setsid "$READER" "$basename".pdf >/dev/null 2>&1 & ;;
 	*.html) setsid $BROWSER "$basename".html >/dev/null 2>&1 & ;;
 	*.sent) setsid sent "$1" >/dev/null 2>&1 & ;;