diff --git a/pkgs/development/tools/analysis/radare2/default.nix b/pkgs/development/tools/analysis/radare2/default.nix
index 1c7c290405fc..198ce101bf56 100644
--- a/pkgs/development/tools/analysis/radare2/default.nix
+++ b/pkgs/development/tools/analysis/radare2/default.nix
@@ -27,8 +27,7 @@
 }:
 
 let
-  # FIXME: how to keep this up-to-date
-  # https://github.com/radareorg/vector35-arch-arm64/
+  # FIXME: Compare revision with https://github.com/radareorg/radare2/blob/master/libr/asm/arch/arm/v35arm64/Makefile#L20
   arm64 = fetchFromGitHub {
     owner = "radareorg";
     repo = "vector35-arch-arm64";