Update README.md

Co-authored-by: Steven G. Johnson <[email protected]>

README.md

@@ -123,7 +123,7 @@ free(fold_str);
 
 ### Normalization Form C/D (NFC/NFD)
 ```c
-// Decompose `åäö` into `a\u0308o\u0308u\u0308`
+// Decompose "\u00e4\u00f6\u00fc" = "äöü" into "a\u0308o\u0308u\u0308" (= "äöü" via combining char U+0308)
 utf8proc_uint8_t input[] = {0xc3, 0xa4, 0xc3, 0xb6, 0xc3, 0xbc}; // åäö
 utf8proc_uint8_t *nfd= utf8proc_NFD(input);