diff --git a/TestGen.hs b/TestGen.hs
index 453d6c4..d0575c7 100755
--- a/TestGen.hs
+++ b/TestGen.hs
@@ -50,7 +50,7 @@ genTestsFor mod imports = do
 
 header :: String -> Imports -> [String]
 header mod imports =
-  [ "-- Generated code, do not modify by hand. Generate by running \"stack build && stack exec test-gen\"."
+  [ "-- Generated code, do not modify by hand. Generate by running TestGen.hs."
   , ""
   , "{-# OPTIONS_GHC -w #-}"
   , "module " ++ mod ++ "Spec where"
diff --git a/test/hspec/Data/Multimap/ConversionsSpec.hs b/test/hspec/Data/Multimap/ConversionsSpec.hs
index 3796b43..0bf861d 100644
--- a/test/hspec/Data/Multimap/ConversionsSpec.hs
+++ b/test/hspec/Data/Multimap/ConversionsSpec.hs
@@ -1,4 +1,4 @@
--- Generated code, do not modify by hand. Generate by running "stack build && stack exec test-gen".
+-- Generated code, do not modify by hand. Generate by running TestGen.hs.
 
 {-# OPTIONS_GHC -w #-}
 module Data.Multimap.ConversionsSpec where
diff --git a/test/hspec/Data/Multimap/InternalSpec.hs b/test/hspec/Data/Multimap/InternalSpec.hs
index d2c5279..bb750a6 100644
--- a/test/hspec/Data/Multimap/InternalSpec.hs
+++ b/test/hspec/Data/Multimap/InternalSpec.hs
@@ -1,4 +1,4 @@
--- Generated code, do not modify by hand. Generate by running "stack build && stack exec test-gen".
+-- Generated code, do not modify by hand. Generate by running TestGen.hs.
 
 {-# OPTIONS_GHC -w #-}
 module Data.Multimap.InternalSpec where
diff --git a/test/hspec/Data/Multimap/Set/InternalSpec.hs b/test/hspec/Data/Multimap/Set/InternalSpec.hs
index 03c0e5e..72c1e54 100644
--- a/test/hspec/Data/Multimap/Set/InternalSpec.hs
+++ b/test/hspec/Data/Multimap/Set/InternalSpec.hs
@@ -1,4 +1,4 @@
--- Generated code, do not modify by hand. Generate by running "stack build && stack exec test-gen".
+-- Generated code, do not modify by hand. Generate by running TestGen.hs.
 
 {-# OPTIONS_GHC -w #-}
 module Data.Multimap.Set.InternalSpec where
diff --git a/test/hspec/Data/Multimap/SetSpec.hs b/test/hspec/Data/Multimap/SetSpec.hs
index 2da4a79..1b60b32 100644
--- a/test/hspec/Data/Multimap/SetSpec.hs
+++ b/test/hspec/Data/Multimap/SetSpec.hs
@@ -1,4 +1,4 @@
--- Generated code, do not modify by hand. Generate by running "stack build && stack exec test-gen".
+-- Generated code, do not modify by hand. Generate by running TestGen.hs.
 
 {-# OPTIONS_GHC -w #-}
 module Data.Multimap.SetSpec where
diff --git a/test/hspec/Data/Multimap/Table/InternalSpec.hs b/test/hspec/Data/Multimap/Table/InternalSpec.hs
index b2a745f..feb1dde 100644
--- a/test/hspec/Data/Multimap/Table/InternalSpec.hs
+++ b/test/hspec/Data/Multimap/Table/InternalSpec.hs
@@ -1,4 +1,4 @@
--- Generated code, do not modify by hand. Generate by running "stack build && stack exec test-gen".
+-- Generated code, do not modify by hand. Generate by running TestGen.hs.
 
 {-# OPTIONS_GHC -w #-}
 module Data.Multimap.Table.InternalSpec where
diff --git a/test/hspec/Data/MultimapSpec.hs b/test/hspec/Data/MultimapSpec.hs
index 11dd3e5..b06c39c 100644
--- a/test/hspec/Data/MultimapSpec.hs
+++ b/test/hspec/Data/MultimapSpec.hs
@@ -1,4 +1,4 @@
--- Generated code, do not modify by hand. Generate by running "stack build && stack exec test-gen".
+-- Generated code, do not modify by hand. Generate by running TestGen.hs.
 
 {-# OPTIONS_GHC -w #-}
 module Data.MultimapSpec where