diff --git a/Makefile b/Makefile
index 90b3c40..39ea023 100644
--- a/Makefile
+++ b/Makefile
@@ -7,7 +7,7 @@ CWARN=-Wall -Wpedantic -Wextra -Wsign-conversion -Wtype-limits -Wunused-result
 G=
 O=-O3
 
-CFILES=compiler.c grammar.c utils.c vm.c file_loader.c viz.c json.c
+CFILES=compiler.c grammar.c utils.c vm.c file_loader.c printing.c json.c
 OBJFILES=$(CFILES:.c=.o)
 
 all: $(NAME)
diff --git a/bp.c b/bp.c
index a9ffe01..cefb5aa 100644
--- a/bp.c
+++ b/bp.c
@@ -15,8 +15,8 @@
 #include "file_loader.h"
 #include "grammar.h"
 #include "json.h"
+#include "printing.h"
 #include "utils.h"
-#include "viz.h"
 #include "vm.h"
 
 static const char *usage = (
diff --git a/viz.c b/printing.c
similarity index 98%
rename from viz.c
rename to printing.c
index a4aa565..68faf22 100644
--- a/viz.c
+++ b/printing.c
@@ -1,16 +1,21 @@
 /*
- * viz.c - Visualize matches.
+ * printing.c - Code for printing and visualizing matches.
  */
 
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
+#include "printing.h"
 #include "types.h"
 #include "utils.h"
-#include "viz.h"
 #include "vm.h"
 
+typedef struct match_node_s {
+    match_t *m;
+    struct match_node_s *next;
+} match_node_t;
+
 typedef struct {
     size_t line, printed_line;
     const char *color;
diff --git a/viz.h b/printing.h
similarity index 51%
rename from viz.h
rename to printing.h
index 8b11bcc..7059562 100644
--- a/viz.h
+++ b/printing.h
@@ -1,13 +1,15 @@
 /*
- * Header file for viz.c (visualizing matches)
+ * Header file for printing.c (printing/visualizing matches)
  */
-#ifndef VIZ__H
-#define VIZ__H
+#ifndef PRINTING__H
+#define PRINTING__H
 
-typedef struct match_node_s {
-    match_t *m;
-    struct match_node_s *next;
-} match_node_t;
+#include "types.h"
+
+typedef enum {
+    PRINT_COLOR = 1<<0,
+    PRINT_LINE_NUMBERS = 1<<1,
+} print_options_t;
 
 __attribute__((nonnull))
 void visualize_match(match_t *m);
diff --git a/vm.h b/vm.h
index 2c17743..148f2b5 100644
--- a/vm.h
+++ b/vm.h
@@ -8,11 +8,6 @@
 
 #include "types.h"
 
-typedef enum {
-    PRINT_COLOR = 1<<0,
-    PRINT_LINE_NUMBERS = 1<<1,
-} print_options_t;
-
 const char *opcode_name(enum VMOpcode o);
 __attribute__((hot, nonnull))
 match_t *match(grammar_t *g, file_t *f, const char *str, vm_op_t *op, unsigned int flags);