diff --git a/debian/control b/debian/control
index b72c761..1a92236 100644
--- a/debian/control
+++ b/debian/control
@@ -8,25 +8,25 @@ Standards-Version: 3.6.0
 Package: elk
 Architecture: any
 Section: interpreters
-Priority: optional
 Depends: ${shlibs:Depends}
 Conflicts: pact (<= 980714-1)
 Description: the Elk Scheme interpreted
- Elk is an implementation of the Scheme programming language,
- designed specifically as an embeddable, reusable extension 
- language subsystem for applications written in C or C++.
+ Elk is an implementation of the Scheme programming language, designed
+ specifically as an embeddable, reusable extension language subsystem for
+ applications written in C or C++.
  .
  This package contains the Elk Scheme interpreter.
 
 Package: libelk0
 Architecture: any
 Section: libs
-Priority: optional
 Depends: ${shlibs:Depends}
+Conflicts: elk (<< 3.99-1)
+Replaces: elk (<< 3.99-1)
 Description: implementation of Scheme (the Extension Language Kit)
- Elk is an implementation of the Scheme programming language,
- designed specifically as an embeddable, reusable extension 
- language subsystem for applications written in C or C++.
+ Elk is an implementation of the Scheme programming language, designed
+ specifically as an embeddable, reusable extension language subsystem for
+ applications written in C or C++.
  .
  This package contains the libelk0 runtime library, as well as several plugins
  shipped with Elk. They provide hooks for Unix system calls, the X Window
@@ -36,23 +36,23 @@ Description: implementation of Scheme (the Extension Language Kit)
 Package: libelk0-dev
 Architecture: any
 Section: libdevel
-Priority: optional
 Depends: ${shlibs:Depends}
+Conflicts: elk (<< 3.99-1)
+Replaces: elk (<< 3.99-1)
 Description: development files for libelk0
- Elk is an implementation of the Scheme programming language,
- designed specifically as an embeddable, reusable extension 
- language subsystem for applications written in C or C++.
+ Elk is an implementation of the Scheme programming language, designed
+ specifically as an embeddable, reusable extension language subsystem for
+ applications written in C or C++.
  .
- This package contains the header files and static library needed to
- compile applications that use libelk0.
+ This package contains the header files and static library needed to compile
+ applications that use libelk0.
 
 Package: elkdoc
 Architecture: all
 Section: doc
-Priority: optional
 Description: documentation for the Extension Language Kit
- Elk is an implementation of the Scheme programming language,
- designed specifically as an embeddable, reusable extension 
- language subsystem for applications written in C or C++.    
+ Elk is an implementation of the Scheme programming language, designed
+ specifically as an embeddable, reusable extension language subsystem for
+ applications written in C or C++.
  .
- Elk is also useful as a stand-alone Scheme implementation.
+ This package contains the Elk documentation.