diff --git a/src/lib.rs b/src/lib.rs
index 3e7002a..628b202 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -65,6 +65,11 @@ impl ChartManager {
 
     // Tests function to make sure it's able to be parsed. Returns the string of the Error produced, or an empty string if it runs successfully.
     pub fn test_func(function_string: String) -> String {
+        // Factorials do not work, and it would be really difficult to make them work
+        if function_string.contains("!") {
+            return "Factorials are unsupported".to_string();
+        }
+
         let new_func_str: String = add_asterisks(function_string.clone());
         let expr_result = new_func_str.parse();
         let expr_error = match &expr_result {
diff --git a/www/index.js b/www/index.js
index 66e527f..1973f30 100644
--- a/www/index.js
+++ b/www/index.js
@@ -122,8 +122,10 @@ function checkVariables() {
 function errorRecommend(error_string) {
     if (error_string.includes("Evaluation error: unknown variable ")) {
         return "This variable is not considered valid. Make sure you used a valid variable.";
+    } else if (error_string == "Factorials are unsupported") {
+        return "";
     } else {
-        return "Make sure you're using proper syntax! Check console log (f12) as well for more details.";
+        return "Make sure you're using proper syntax! Check console log (press F12) as well for more details.";
     }
 }