diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Revision history for bludigon
 
-## 0.1.0.0 -- YYYY-mm-dd
+## 0.1.0.1 -- 2020-08-02
+
+* Add header file to c-sources.
+
+## 0.1.0.0 -- 2020-08-02
 
 * First version. Released on an unsuspecting world.
diff --git a/bludigon.cabal b/bludigon.cabal
--- a/bludigon.cabal
+++ b/bludigon.cabal
@@ -1,5 +1,5 @@
 name:                bludigon
-version:             0.1.0.0
+version:             0.1.0.1
 synopsis:            Configurable blue light filter
 description:         This application is a blue light filter, with the main focus on
                      configurability.
@@ -63,6 +63,7 @@
   extra-libraries:     X11, Xrandr
   include-dirs:        include
   c-sources:           include/XrandrGamma.c
+                       include/XrandrGamma.h
   default-language:    Haskell2010
   default-extensions:  ConstraintKinds
                        DataKinds
diff --git a/include/XrandrGamma.h b/include/XrandrGamma.h
new file mode 100644
--- /dev/null
+++ b/include/XrandrGamma.h
@@ -0,0 +1,4 @@
+#include <X11/Xlib.h>
+#include <X11/extensions/Xrandr.h>
+
+void setGamma (float red, float green, float blue, XRRScreenResources *res, Display *dpy);