diff --git a/BlockFormat_LZSA2.md b/BlockFormat_LZSA2.md
index 15ec378..2a9b6c3 100644
--- a/BlockFormat_LZSA2.md
+++ b/BlockFormat_LZSA2.md
@@ -44,7 +44,7 @@ The match offset is decoded according to the XYZ bits in the token
     XYZ
     00Z 5-bit offset: read a nibble for offset bits 1-4 and use the inverted bit Z of the token as bit 0 of the offset. set bits 5-15 of the offset to 1.
     01Z 9-bit offset: read a byte for offset bits 0-7 and use the inverted bit Z for bit 8 of the offset. set bits 9-15 of the offset to 1.
-    10Z 13-bit offset: read a nibble for offset bits 9-12 and use the inverted bit Z for bit 8 of the offset, then read a byte for offset bits 0-7. set bits 13-15 of the offset to 1.
+    10Z 13-bit offset: read a nibble for offset bits 9-12 and use the inverted bit Z for bit 8 of the offset, then read a byte for offset bits 0-7. set bits 13-15 of the offset to 1. substract 512 from the offset to get the final value.
     110 16-bit offset: read a byte for offset bits 8-15, then another byte for offset bits 0-7.
     111 repeat offset: reuse the offset value of the previous match command.
 
diff --git a/StreamFormat.md b/StreamFormat.md
index 3f37f86..8eebb7e 100644
--- a/StreamFormat.md
+++ b/StreamFormat.md
@@ -17,7 +17,7 @@ The 3-bytes LZSA header contains a signature and a traits byte:
 
 Trait bits:
 
-* V: 3 bit code that indicates which block data encoding is used. 0 is LZSA1 and 2 is LZSA2.
+* V: 3 bit code that indicates which block data encoding is used. 0 is LZSA1 and 1 is LZSA2.
 * Z: these bits in the traits are set to 0 for LZSA1 and LZSA2.
 
 # Frame format