BIP 9: Clarify nVersion interpretation and bit order

bip-0009.mediawiki

@@ -51,6 +51,8 @@ With each block and soft fork, we associate a deployment state. The possible sta
 
 ===Bit flags===
 
+The nVersion block header field is to be interpreted as a 32-bit little-endian integer (as present), and bits are selected within this integer as values (1 << N) where N is the bit number.
+
 Blocks in the STARTED state get an nVersion whose bit position bit is set to 1. The top 3 bits of such blocks must be
 001, so the range of actually possible nVersion values is [0x20000000...0x3FFFFFFF], inclusive.