diff --git a/libwvdrmengine/docs/WidevineModularDRMSecurityIntegrationGuideforCENC.pdf b/libwvdrmengine/docs/WidevineModularDRMSecurityIntegrationGuideforCENC.pdf
index 6da38c8d..526b27d7 100644
Binary files a/libwvdrmengine/docs/WidevineModularDRMSecurityIntegrationGuideforCENC.pdf and b/libwvdrmengine/docs/WidevineModularDRMSecurityIntegrationGuideforCENC.pdf differ
diff --git a/libwvdrmengine/oemcrypto/include/OEMCryptoCENC.h b/libwvdrmengine/oemcrypto/include/OEMCryptoCENC.h
index ba095d4d..b1a2a287 100644
--- a/libwvdrmengine/oemcrypto/include/OEMCryptoCENC.h
+++ b/libwvdrmengine/oemcrypto/include/OEMCryptoCENC.h
@@ -1498,7 +1498,7 @@ const char* OEMCrypto_SecurityLevel();
  *   0x1 - HDCP version 1.0
  *   0x2 - HDCP version 2.0
  *   0x3 - HDCP version 2.1
- *   0x4 - HDCP version 2.2
+ *   0x4 - HDCP version 2.2 Type 1 (Downstream devices must also use v2.2)
  *   0xFF - No HDCP device attached/using local display with secure path.
  *
  * Parameters: