diff --git a/tmc-langs-framework/src/main/java/fi/helsinki/cs/tmc/langs/domain/MetaSyntaxGenerator.java b/tmc-langs-framework/src/main/java/fi/helsinki/cs/tmc/langs/domain/MetaSyntaxGenerator.java
index fba101b3f..85912d233 100644
--- a/tmc-langs-framework/src/main/java/fi/helsinki/cs/tmc/langs/domain/MetaSyntaxGenerator.java
+++ b/tmc-langs-framework/src/main/java/fi/helsinki/cs/tmc/langs/domain/MetaSyntaxGenerator.java
@@ -20,7 +20,7 @@ public static List<MetaSyntax> listSyntaxes(String fileType) {
             list.add(new MetaSyntax("\\/\\*+", "\\*+\\/")); /* */
         } else if (fileType.matches("xml|http|html")) {
             list.add(new MetaSyntax("<!--", "-->"));
-        } else if (fileType.matches("properties|py")) {
+        } else if (fileType.matches("properties|py|R")) {
             list.add(new MetaSyntax("#", ""));
         }
         cache.put(fileType, list);