diff --git a/src/nix/flake.cc b/src/nix/flake.cc
index 8634733d6..3b37ad7a0 100644
--- a/src/nix/flake.cc
+++ b/src/nix/flake.cc
@@ -129,7 +129,7 @@ struct CmdFlakeInfo : FlakeCommand, MixJSON, MixEvalArgs, StoreCommand
         return "list info about a given flake";
     }
 
-    CmdFlakeInfo () { evalSettings.pureEval = false; }
+    CmdFlakeInfo () { evalSettings.pureEval = false; /* FIXME */ }
 
     void run(nix::ref<nix::Store> store) override
     {
@@ -158,7 +158,7 @@ struct CmdFlakeAdd : MixEvalArgs, Command
     {
         expectArg("alias", &alias);
         expectArg("flake-uri", &uri);
-        evalSettings.pureEval = false;
+        evalSettings.pureEval = false; // FIXME
     }
 
     void run() override
@@ -189,7 +189,7 @@ struct CmdFlakeRemove : virtual Args, MixEvalArgs, Command
     CmdFlakeRemove()
     {
         expectArg("alias", &alias);
-        evalSettings.pureEval = false;
+        evalSettings.pureEval = false; // FIXME
     }
 
     void run() override
@@ -218,7 +218,7 @@ struct CmdFlakePin : virtual Args, StoreCommand, MixEvalArgs
     CmdFlakePin()
     {
         expectArg("alias", &alias);
-        evalSettings.pureEval = false;
+        evalSettings.pureEval = false; // FIXME
     }
 
     void run(nix::ref<nix::Store> store) override