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diff --git a/Introduction-to-QuakeC.md b/Introduction-to-QuakeC.md
index 6b8770f..aaa5fe2 100644
--- a/Introduction-to-QuakeC.md
+++ b/Introduction-to-QuakeC.md
@@ -152,7 +152,17 @@ A *string* in QuakeC is an immutable reference to a null-terminated character st
 
 The offset defines from which starting position to search, and the return value is `–1` if no match is found. The offset returned is *0*-based, and to search in the whole string, a start offset of *0* would be used.
 
--   **substring(string, startpos, length)** returns part of a string. The offset is *0*-based here, too.
+-   **strreplace(old, new, string)** searches for certain characters in a string and replaces them with other characters, as in:
+    ```c
+    strreplace("de", "con", "destruction") == "construction";
+    ```
+
+-   **substring(string, startpos, length)** returns part of a string.
+
+The offset is *0*-based here, too. A length of `-1` designates the end of the string (it will return the part of the string after the start position), a length of `-2` designates the penultimate character of the string, and so on.
+
+-   **strtoupper(string)** capitalizes a string.
+-   **strtolower(string)** lowercases a string.
 
 Note that there are different kinds of *strings*, regarding memory management: