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diff --git a/README.md b/README.md
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@@ -52,6 +52,8 @@ man occurrences
 
 ## Usage
 
+Warning: This program is only compatible with ASCII input, this doesn't include tab or new line characters
+
 1. Run the program.
 2. Enter a string when prompted.
 3. The program will output the number of characters, digits, and vowels in the input string.