diff --git a/lib/std/meta.zig b/lib/std/meta.zig
index 9940fafba08b7305136479dc2db19782aa56a219..e6ce746f192ba9db7d32eefbe50136a2da4d9fa0 100644
--- a/lib/std/meta.zig
+++ b/lib/std/meta.zig
@@ -97,6 +97,8 @@ test "std.meta.stringToEnum" {
     try testing.expect(null == stringToEnum(E1, "C"));
 }
 
+/// Deprecated, use `@bitSizeOf()`.
+/// TODO Remove this after zig 0.10.0 is released.
 pub fn bitCount(comptime T: type) comptime_int {
     return switch (@typeInfo(T)) {
         .Bool => 1,