diff --git a/src/Test/Tasty/Bench/Equalize.hs b/src/Test/Tasty/Bench/Equalize.hs
index 413a9b3..9cc1e6a 100644
--- a/src/Test/Tasty/Bench/Equalize.hs
+++ b/src/Test/Tasty/Bench/Equalize.hs
@@ -1,8 +1,8 @@
-{-# LANGUAGE CPP #-}
 {-# LANGUAGE NumDecimals #-}
 {-# LANGUAGE RecordWildCards #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 
+-- | Find a tipping point between two algorithms.
 module Test.Tasty.Bench.Equalize (
   equalize,
   mkEqualizeConfig,
@@ -13,27 +13,31 @@ import Control.DeepSeq (NFData)
 import System.IO.Unsafe (unsafeInterleaveIO)
 import Test.Tasty (Timeout (..))
 import Test.Tasty.Bench (Benchmarkable, RelStDev (..), measureCpuTimeAndStDev, nf)
+import Test.Tasty.Bench.Utils (traceShowM')
 
-#ifdef DEBUG
-import Debug.Trace
-#endif
-
--- | Configuration for 'fit'.
+-- | Configuration for 'equalize'.
 data EqualizeConfig = EqualizeConfig
   { eqlFasterOnLow :: Word -> Benchmarkable
+  -- ^ A benchmark which is faster at 'eqlLow', typically 'nf' @f@.
   , eqlFasterOnHigh :: Word -> Benchmarkable
+  -- ^ A benchmark which is faster at 'eqlHigh', typically 'nf' @g@.
   , eqlLow :: Word
+  -- ^ An argument at which 'eqlFasterOnLow' is faster than 'eqlFasterOnHigh'.
   , eqlHigh :: Word
+  -- ^ An argument at which 'eqlFasterOnHigh' is faster than 'eqlFasterOnLow'.
   , eqlTimeout :: Timeout
+  -- ^ Timeout of individual measurements.
   }
 
 -- | Generate a default 'equalize' configuration.
 mkEqualizeConfig
   :: (NFData a)
   => (Word -> a)
+  -- ^ An algorithm which is faster for small arguments, without 'nf'.
   -> (Word -> a)
+  -- ^ An algorithm which is faster for large arguments, without 'nf'.
   -> (Word, Word)
-  -- ^ The smallest and the largest sizes of the input.
+  -- ^ A small and a large arguments.
   -> EqualizeConfig
 mkEqualizeConfig fLow fHigh (low, high) =
   EqualizeConfig
@@ -64,10 +68,3 @@ equalize EqualizeConfig {..} = go (RelStDev 1.0) eqlLow eqlHigh
                   if mean2 + 2 * stdev2 < mean1 - 2 * stdev1
                     then go std lo mid
                     else go (RelStDev $ std' / 2) lo hi
-
-traceShowM' :: (Applicative m, Show a) => a -> m ()
-#ifdef DEBUG
-traceShowM' = traceShowM
-#else
-traceShowM' = const (pure ())
-#endif
diff --git a/src/Test/Tasty/Bench/Fit.hs b/src/Test/Tasty/Bench/Fit.hs
index e628a74..7c86978 100644
--- a/src/Test/Tasty/Bench/Fit.hs
+++ b/src/Test/Tasty/Bench/Fit.hs
@@ -1,4 +1,3 @@
-{-# LANGUAGE CPP #-}
 {-# LANGUAGE NumDecimals #-}
 {-# LANGUAGE RecordWildCards #-}
 {-# LANGUAGE ScopedTypeVariables #-}
@@ -48,10 +47,7 @@ import Test.Tasty.Bench.Fit.Complexity (
   isLogarithmic,
   isQuadratic,
  )
-
-#ifdef DEBUG
-import Debug.Trace
-#endif
+import Test.Tasty.Bench.Utils (traceShowM')
 
 -- | Configuration for 'fit'.
 data FitConfig = FitConfig
@@ -200,10 +196,3 @@ fits FitConfig {..} = unsafeInterleaveIO $ do
 
 d :: Word -> Double
 d = fromIntegral
-
-traceShowM' :: (Applicative m, Show a) => a -> m ()
-#ifdef DEBUG
-traceShowM' = traceShowM
-#else
-traceShowM' = const (pure ())
-#endif
diff --git a/tasty-bench-fit.cabal b/tasty-bench-fit.cabal
index 11134ef..43cf7f9 100644
--- a/tasty-bench-fit.cabal
+++ b/tasty-bench-fit.cabal
@@ -36,7 +36,10 @@ library
         Test.Tasty.Bench.Equalize
 
     hs-source-dirs:   src
-    other-modules:    Test.Tasty.Bench.Fit.Complexity
+    other-modules:
+        Test.Tasty.Bench.Fit.Complexity
+        Test.Tasty.Bench.Utils
+
     default-language: Haskell2010
     ghc-options:      -Wall
     build-depends: