diff --git a/keydive/constants.py b/keydive/constants.py
index 302ee42..9efa9a0 100644
--- a/keydive/constants.py
+++ b/keydive/constants.py
@@ -82,31 +82,32 @@ OEM_CRYPTO_API = {
     # Add more as needed for different versions.
 }
 
+# TODO: Add minimum required sdk
 CDM_VENDOR_API = {
     'mediaserver': {
-        Vendor(11, '1.0', 'libwvdrmengine.so')
+        Vendor(11, '1.0', 'libwvdrmengine.so')  # 23
     },
     'mediadrmserver': {
-        Vendor(11, '1.0', 'libwvdrmengine.so')
+        Vendor(11, '1.0', 'libwvdrmengine.so')  # 24
     },
     'android.hardware.drm@1.0-service.widevine': {
-        Vendor(13, '5.1.0', 'libwvhidl.so')
+        Vendor(13, '5.1.0', 'libwvhidl.so')  # 26
     },
     'android.hardware.drm@1.1-service.widevine': {
-        Vendor(14, '14.0.0', 'libwvhidl.so')
+        Vendor(14, '14.0.0', 'libwvhidl.so')  # 28
     },
     'android.hardware.drm@1.2-service.widevine': {
-        Vendor(15, '15.0.0', 'libwvhidl.so')
+        Vendor(15, '15.0.0', 'libwvhidl.so')  # 29
     },
     'android.hardware.drm@1.3-service.widevine': {
-        Vendor(16, '16.0.0', 'libwvhidl.so')
+        Vendor(16, '16.0.0', 'libwvhidl.so')  # 30
     },
     'android.hardware.drm@1.4-service.widevine': {
-        Vendor(16, '16.1.0', 'libwvhidl.so')
+        Vendor(16, '16.1.0', 'libwvhidl.so')  # 31
     },
     'android.hardware.drm-service.widevine': {
-        Vendor(17, '17.0.0', 'libwvaidl.so'),
-        Vendor(18, '18.0.0', 'android.hardware.drm-service.widevine')
+        Vendor(17, '17.0.0', 'libwvaidl.so'),  # 33
+        Vendor(18, '18.0.0', 'android.hardware.drm-service.widevine')  # 34
     }
 }