diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,9 @@
 # Revision history for cl3-hmatrix-interface
 
-## 1.0.0.0  -- 2018-5-26
+## 1.0.0.1  -- 2018-06-20
+
+* Used Stack to verify compatibility with earlier versions of GHC and Stackage lts
+
+## 1.0.0.0  -- 2018-06-02
 
 * First version. Released on an unsuspecting world.
diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -7,6 +7,6 @@
 *  toHMatrix
 *  fromHMatrix
 
-
+Note: Please make sure your HMatrix Matrix is a 2x2 Complex Double.
 
 
diff --git a/cl3-hmatrix-interface.cabal b/cl3-hmatrix-interface.cabal
--- a/cl3-hmatrix-interface.cabal
+++ b/cl3-hmatrix-interface.cabal
@@ -10,7 +10,7 @@
 -- PVP summary:      +-+------- breaking API changes
 --                   | | +----- non-breaking API additions
 --                   | | | +--- code changes with no API change
-version:             1.0.0.0
+version:             1.0.0.1
 
 -- A short (one-line) description of the package.
 synopsis:            Interface to/from Cl3 and HMatrix.
@@ -45,7 +45,9 @@
 
 -- Extra files to be distributed with the package, such as examples or a 
 -- README.
-extra-source-files:  ChangeLog.md, README.md
+extra-source-files:  ChangeLog.md, 
+                     README.md,
+                     stack.yaml
 
 -- Constraint on the version of Cabal needed to build this package.
 cabal-version:       >=1.10
@@ -69,8 +71,8 @@
   
   -- Other library packages from which modules are imported.
   build-depends:       
-    base >=4.8 && <5,
-    cl3 >=1.0 && <2,
+    base >=4.7 && <5,
+    cl3 >=1.0.0.2 && <2,
     hmatrix >=0.16 && <1
   
   -- Directories containing source files.
diff --git a/stack.yaml b/stack.yaml
new file mode 100644
--- /dev/null
+++ b/stack.yaml
@@ -0,0 +1,5 @@
+packages:
+- .
+resolver: lts-9.21
+extra-deps:
+- cl3-1.0.0.2