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-rw-r--r--docs/architecture.md3
1 files changed, 2 insertions, 1 deletions
diff --git a/docs/architecture.md b/docs/architecture.md
index dd34426..4e57be0 100644
--- a/docs/architecture.md
+++ b/docs/architecture.md
@@ -350,7 +350,8 @@ Format:
|Range (VHDL)|Description|
|-|-|
-|`31 downto 18`|(unused)|
+|`31 downto 19`|(unused)|
+|`18`|System reset|
|`17`|Fetch foreground sprites flag|
|`16 downto 8`|Horizontal background scroll (offset from left edge)|
|`7 downto 0`|Vertical background scroll (offset from top edge)|