diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+## 0.1.1.1 - 2023-03-01
+
+Removed a useless type alias.
+
+
 ## 0.1.1.0 - 2023-02-25
 
 Some values of the Jacobi theta functions were wrong.
diff --git a/jacobi-theta.cabal b/jacobi-theta.cabal
--- a/jacobi-theta.cabal
+++ b/jacobi-theta.cabal
@@ -1,5 +1,5 @@
 name:                jacobi-theta
-version:             0.1.1.0
+version:             0.1.1.1
 synopsis:            Jacobi Theta Functions
 description:         Evaluation of the Jacobi theta functions.
 homepage:            https://github.com/stla/jacobi-theta#readme
diff --git a/src/Math/JacobiTheta.hs b/src/Math/JacobiTheta.hs
--- a/src/Math/JacobiTheta.hs
+++ b/src/Math/JacobiTheta.hs
@@ -96,39 +96,39 @@
 
 -- | First Jacobi theta function
 jtheta1 :: 
-     Cplx -- ^ z
-  -> Cplx -- ^ q, the nome
-  -> Cplx
+     Complex Double -- ^ z
+  -> Complex Double -- ^ q, the nome
+  -> Complex Double
 jtheta1 z q = jtheta1Alt z (getTauFromQ q)
 
 -- | Second Jacobi theta function
 jtheta2 :: 
-     Cplx -- ^ z
-  -> Cplx -- ^ q, the nome
-  -> Cplx
+     Complex Double -- ^ z
+  -> Complex Double -- ^ q, the nome
+  -> Complex Double
 jtheta2 z = jtheta1 (z + pi/2)
 
 -- | Third Jacobi theta function
 jtheta3 :: 
-     Cplx -- ^ z
-  -> Cplx -- ^ q, the nome
-  -> Cplx
+     Complex Double -- ^ z
+  -> Complex Double -- ^ q, the nome
+  -> Complex Double
 jtheta3 z q = jtheta2 (z - pi/2 * tau) q * expM (-z) tau
   where
     tau = tauFromQ q
 
 -- | Fourth Jacobi theta function
 jtheta4 :: 
-     Cplx -- ^ z
-  -> Cplx -- ^ q, the nome
-  -> Cplx
+     Complex Double -- ^ z
+  -> Complex Double -- ^ q, the nome
+  -> Complex Double
 jtheta4 z = jtheta3 (z + pi/2)
 
 -- | Derivative of the first Jacobi theta function
 jtheta1Dash :: 
-     Cplx -- ^ z
-  -> Cplx -- ^ q, the nome
-  -> Cplx
+     Complex Double -- ^ z
+  -> Complex Double -- ^ q, the nome
+  -> Complex Double
 jtheta1Dash z q = 
   go 0 (0.0 :+ 0.0) 1.0 (1.0 / qsq) 1.0
   where