diff --git a/extra/compiler/cfg/gvn/alien/alien.factor b/extra/compiler/cfg/gvn/alien/alien.factor
index 5e4edfe305..a83fc13000 100644
--- a/extra/compiler/cfg/gvn/alien/alien.factor
+++ b/extra/compiler/cfg/gvn/alien/alien.factor
@@ -1,4 +1,4 @@
-! Copyright (C) 2010 Slava Pestov.
+! Copyright (C) 2010 Slava Pestov, 2011 Alex Vondrak
 ! See http://factorcode.org/license.txt for BSD license.
 USING: accessors combinators combinators.short-circuit fry
 kernel make math namespaces sequences
diff --git a/extra/compiler/cfg/gvn/comparisons/comparisons.factor b/extra/compiler/cfg/gvn/comparisons/comparisons.factor
index 3b86a01593..254edb1327 100644
--- a/extra/compiler/cfg/gvn/comparisons/comparisons.factor
+++ b/extra/compiler/cfg/gvn/comparisons/comparisons.factor
@@ -1,4 +1,4 @@
-! Copyright (C) 2010 Slava Pestov.
+! Copyright (C) 2010 Slava Pestov, 2011 Alex Vondrak.
 ! See http://factorcode.org/license.txt for BSD license.
 USING: accessors combinators kernel math math.order namespaces
 sequences vectors combinators.short-circuit
diff --git a/extra/compiler/cfg/gvn/expressions/expressions.factor b/extra/compiler/cfg/gvn/expressions/expressions.factor
index 52b813012b..62a061499e 100644
--- a/extra/compiler/cfg/gvn/expressions/expressions.factor
+++ b/extra/compiler/cfg/gvn/expressions/expressions.factor
@@ -1,4 +1,4 @@
-! Copyright (C) 2008, 2010 Slava Pestov.
+! Copyright (C) 2008, 2010 Slava Pestov, 2011 Alex Vondrak.
 ! See http://factorcode.org/license.txt for BSD license.
 USING: assocs accessors arrays classes classes.algebra
 combinators fry generic.parser kernel math namespaces
diff --git a/extra/compiler/cfg/gvn/graph/graph.factor b/extra/compiler/cfg/gvn/graph/graph.factor
index 54ad502336..76f4bedbfc 100644
--- a/extra/compiler/cfg/gvn/graph/graph.factor
+++ b/extra/compiler/cfg/gvn/graph/graph.factor
@@ -1,4 +1,4 @@
-! Copyright (C) 2008, 2010 Slava Pestov.
+! Copyright (C) 2008, 2010 Slava Pestov, 2011 Alex Vondrak.
 ! See http://factorcode.org/license.txt for BSD license.
 USING: accessors kernel math namespaces assocs ;
 IN: compiler.cfg.gvn.graph
diff --git a/extra/compiler/cfg/gvn/gvn.factor b/extra/compiler/cfg/gvn/gvn.factor
index 40281d0299..ef449ce459 100644
--- a/extra/compiler/cfg/gvn/gvn.factor
+++ b/extra/compiler/cfg/gvn/gvn.factor
@@ -1,4 +1,4 @@
-! Copyright (C) 2008, 2010 Slava Pestov.
+! Copyright (C) 2008, 2010 Slava Pestov, 2011 Alex Vondrak
 ! See http://factorcode.org/license.txt for BSD license.
 USING: namespaces arrays assocs hashtables kernel accessors fry
 grouping sorting sets sequences locals
diff --git a/extra/compiler/cfg/gvn/math/math.factor b/extra/compiler/cfg/gvn/math/math.factor
index 0b6f4291dc..56bfb2da2f 100644
--- a/extra/compiler/cfg/gvn/math/math.factor
+++ b/extra/compiler/cfg/gvn/math/math.factor
@@ -1,7 +1,8 @@
-! Copyright (C) 2010 Slava Pestov.
+! Copyright (C) 2010 Slava Pestov, 2011 Alex Vondrak.
 ! See http://factorcode.org/license.txt for BSD license.
 USING: accessors combinators combinators.short-circuit
-cpu.architecture fry kernel layouts locals make math sequences
+cpu.architecture fry kernel layouts locals make math namespaces
+sequences
 compiler.cfg.instructions
 compiler.cfg.registers
 compiler.cfg.utilities
diff --git a/extra/compiler/cfg/gvn/misc/misc.factor b/extra/compiler/cfg/gvn/misc/misc.factor
index 965334f22d..c55778799c 100644
--- a/extra/compiler/cfg/gvn/misc/misc.factor
+++ b/extra/compiler/cfg/gvn/misc/misc.factor
@@ -1,7 +1,6 @@
 ! Copyright (C) 2010 Slava Pestov.
 ! See http://factorcode.org/license.txt for BSD license.
-USING: accessors assocs cpu.architecture grouping kernel
-sequences
+USING: accessors cpu.architecture kernel
 compiler.cfg.instructions
 compiler.cfg.utilities
 compiler.cfg.gvn.graph
diff --git a/extra/compiler/cfg/gvn/simd/simd.factor b/extra/compiler/cfg/gvn/simd/simd.factor
index ce7eb0779d..36c63e65f6 100644
--- a/extra/compiler/cfg/gvn/simd/simd.factor
+++ b/extra/compiler/cfg/gvn/simd/simd.factor
@@ -1,4 +1,4 @@
-! Copyright (C) 2008, 2010 Slava Pestov.
+! Copyright (C) 2008, 2010 Slava Pestov, 2011 Alex Vondrak.
 ! See http://factorcode.org/license.txt for BSD license.
 USING: accessors combinators combinators.short-circuit arrays
 fry kernel layouts math namespaces sequences cpu.architecture
diff --git a/extra/compiler/cfg/gvn/slots/slots.factor b/extra/compiler/cfg/gvn/slots/slots.factor
index d4ae555c04..afd2ab89e5 100644
--- a/extra/compiler/cfg/gvn/slots/slots.factor
+++ b/extra/compiler/cfg/gvn/slots/slots.factor
@@ -1,4 +1,4 @@
-! Copyright (C) 2010 Slava Pestov.
+! Copyright (C) 2010 Slava Pestov, 2011 Alex Vondrak.
 ! See http://factorcode.org/license.txt for BSD license.
 USING: accessors combinators.short-circuit cpu.architecture fry
 kernel math
diff --git a/extra/compiler/cfg/gvn/testing/testing.factor b/extra/compiler/cfg/gvn/testing/testing.factor
index c434236d55..b459546c51 100644
--- a/extra/compiler/cfg/gvn/testing/testing.factor
+++ b/extra/compiler/cfg/gvn/testing/testing.factor
@@ -1,5 +1,5 @@
-! Copyright (C) 2011 Alex Vondrak.  See
-! http://factorcode.org/license.txt for BSD license.
+! Copyright (C) 2011 Alex Vondrak.
+! See http://factorcode.org/license.txt for BSD license.
 USING: accessors assocs compiler.cfg compiler.cfg.graphviz
 compiler.cfg.gvn compiler.cfg.gvn.expressions
 compiler.cfg.gvn.graph compiler.cfg.optimizer continuations