a bit of clarification in the docs for decode_n() and transcode_n()

src/vmod_blobcode.vcc

@@ -150,7 +150,9 @@ $Function BLOB decode_n(INT n,
 			STRING_LIST encoded)
 
 Description
-	Same as ``decode()``, but only decode ``n`` characters.
+	Same as ``decode()``, but only decode the first ``n`` characters
+	of the decoded string. If ``n`` is greater than the length of
+	the string, then return the same result as ``decode()``.
 
 $Function STRING encode(ENUM {IDENTITY, BASE64, BASE64URL, BASE64URLNOPAD,
                               HEXUC, HEXLC} encoding, BLOB blob)
@@ -187,7 +189,8 @@ $Function STRING transcode_n(INT n,
                              STRING_LIST encoded)
 
 Description
-	Same as ``transcode()``, but only transcode ``n`` characters.
+	Same as ``transcode()``, but only from the first ``n`` characters
+	of the encoded string.
 
 $Function STRING version()