diff --git a/vhdstrenc.h b/vhdstrenc.h
index 9676bc0..ae95eed 100644
--- a/vhdstrenc.h
+++ b/vhdstrenc.h
@@ -4,5 +4,15 @@ typedef enum {
     VHD_UTF_16_LE
 } VHDUtfType;
 
+/* Convert string between UTF-8 and UTF-16LE
+   
+   toUTF:    determines what encoding out_str will be
+   in_str:   String to convert. String shall be null terminated UTF-16LE or UTF-8, and is expected to be the 
+             opposite encoding from toUTF
+   out_str:  Pointer to output string pointer. Encoding shall be determined by toUTF, and is null terminated.
+             It is the callers repsponsibility to free the memory allocated by this function. */
 int vhd_utf_convert(VHDUtfType toUTF, void* in_str, void** out_str);
+/* Count the number of "characters" in a null terminated UTF-16 string. Not a true character count, as surrogate
+   pairs are counted as two "characters". Appears to be the Windows definition of a character for filepath 
+   purposes. */
 size_t vhd_u16_strlen(uint16_t* u16_str);
\ No newline at end of file