diff --git a/src/bot/filter.ts b/src/bot/filter.ts
index 744a64e..e4d8d77 100644
--- a/src/bot/filter.ts
+++ b/src/bot/filter.ts
@@ -11,6 +11,7 @@ function splitWords(filterValue: string): string[] {
     });
 }
 
+// Includes all input words (space separated)
 export const all = (filter: Filter, input: string) => {
     try {
         const flags = filter.is_insensitive ? "i" : "";
@@ -22,6 +23,7 @@ export const all = (filter: Filter, input: string) => {
     }
 };
 
+// Includes any input word (space separated)
 export const any = (filter: Filter, input: string) => {
     try {
         const flags = filter.is_insensitive ? "i" : "";
@@ -34,10 +36,19 @@ export const any = (filter: Filter, input: string) => {
     }
 };
 
+// Includes exact input string
 export const literal = (filter: Filter, input: string) => {
-    throw new Error("'literal' filter not implemented");
+    try {
+        const filterValue = filter.is_insensitive ? filter.value.toLowerCase() : input;
+        const inputValue = filter.is_insensitive ? input.toLowerCase() : input;
+        return inputValue.includes(filterValue);
+    } catch (error) {
+        console.error(`LITERAL: Invalid regex pattern: ${filter.value}`, error);
+        return false;
+    }
 };
 
+// Matches given regex pattern
 export const regex = (filter: Filter, input: string) => {
     try {
         const flags = filter.is_insensitive ? "i" : "";