diff --git a/wadsrc/static/engine/grpinfo.txt b/wadsrc/static/engine/grpinfo.txt
index cd9ea57e1..2a41aa8f8 100644
--- a/wadsrc/static/engine/grpinfo.txt
+++ b/wadsrc/static/engine/grpinfo.txt
@@ -32,6 +32,7 @@ CRC
 	BLOOD10_CRC 0xB291418f
 	BLOOD11_CRC 0xC3A99936
 	BLOOD_CRC 0xA8FDDA84
+	BLOODCP_CRC 0xC6DF85ED
 	SWREG12_CRC 0x7545319F
 	SWWD_CRC 0xA9AAA7B7
 	SWTD_CRC 0xA1A65BE8
@@ -527,6 +528,21 @@ grpinfo
 	GameID "CrypticPassage"
 }
 
+grpinfo
+{
+	// This is for detecting SSI versions of the mod.
+	name "BLOOD: Cryptic Passage"
+	scriptname "CRYPTIC.INI"
+	mustcontain "CRYPTIC.INI", "CP01.MAP", "CP02.MAP"
+	flags GAMEFLAG_BLOOD|GAMEFLAG_ADDON|GAMEFLAG_BLOODCP
+	dependency BLOOD_CRC
+	size 9753361
+	crc BLOODCP_CRC
+	loadart "CPART07.AR_", "CPART15.AR_"
+	gamefilter "Blood.Cryptic"
+	GameID "CrypticPassage"
+}
+
 addon
 {
 	// This is for detecting the files inside the Blood folder itself