diff --git a/android/sdk.go b/android/sdk.go
index a9cc547..42f95b7 100644
--- a/android/sdk.go
+++ b/android/sdk.go
@@ -735,8 +735,8 @@
 	//   have common values. Those fields are cleared and the common value added to the common
 	//   properties.
 	//
-	//   A field annotated with a tag of `sdk:"keep"` will be treated as if it
-	//   was not capitalized, i.e. not optimized for common values.
+	//   A field annotated with a tag of `sdk:"ignore"` will be treated as if it
+	//   was not capitalized, i.e. ignored and not optimized for common values.
 	//
 	//   A field annotated with a tag of `android:"arch_variant"` will be allowed to have
 	//   values that differ by arch, fields not tagged as such must have common values across
@@ -923,18 +923,18 @@
 	// the locations of any of their prebuilt files in the snapshot by os type to prevent them
 	// from colliding. See OsPrefix().
 	//
-	// This property is the same for all variants of a member and so would be optimized away
-	// if it was not explicitly kept.
-	Os_count int `sdk:"keep"`
+	// Ignore this property during optimization. This is needed because this property is the same for
+	// all variants of a member and so would be optimized away if it was not ignored.
+	Os_count int `sdk:"ignore"`
 
 	// The os type for which these properties refer.
 	//
 	// Provided to allow a member to differentiate between os types in the locations of their
 	// prebuilt files when it supports more than one os type.
 	//
-	// This property is the same for all os type specific variants of a member and so would be
-	// optimized away if it was not explicitly kept.
-	Os OsType `sdk:"keep"`
+	// Ignore this property during optimization. This is needed because this property is the same for
+	// all variants of a member and so would be optimized away if it was not ignored.
+	Os OsType `sdk:"ignore"`
 
 	// The setting to use for the compile_multilib property.
 	Compile_multilib string `android:"arch_variant"`