diff --git a/etc/Makefile b/etc/Makefile
index 4bee0f0..adc04df 100644
--- a/etc/Makefile
+++ b/etc/Makefile
@@ -59,7 +59,7 @@ appcallgraph: $(APPCALLGRAPH)
 	./graphdeps.py $< --out $@ --showops
 
 ../%/callgraph.pdf: ../%/callgraph.d 
-	(cd $(dir $@);	../../etc/graphdeps.py $(notdir $<) --out $(notdir $@))
+	(cd $(dir $@);	../../etc/graphdeps.py --calls $(notdir $<) --out $(notdir $@))
 
 ../%/files.d: ../%/Makefile
 	(cd $(dir $@);	../../etc/makemake.py --relpath --files . . ../../drivers ../../drivers/avr ../../utils --exclude system.h > files.d)
diff --git a/etc/graphdeps.py b/etc/graphdeps.py
index 475efe7..2df457d 100755
--- a/etc/graphdeps.py
+++ b/etc/graphdeps.py
@@ -61,6 +61,10 @@ def node_output (dotfile, name, options):
         colour = 'orange'
         shape = 'rectangle'
 
+    if options.calls:
+        colour = 'magenta'
+        shape = 'rectangle'
+
     dotfile.write ('\t"' + name + '"\t [style=filled,shape=' + shape + ',color=' + colour + '];\n')
 
     return name
@@ -145,6 +149,10 @@ def main(argv = None):
                       dest = 'modules', default = False,
                       help = 'show module dependencies')
 
+    parser.add_option('--calls', action = 'store_true',
+                      dest = 'calls', default = False,
+                      help = 'show callgraph')
+
     parser.add_option('--fullpaths', action = 'store_true',
                       dest = 'fullpaths', default = False,
                       help = 'show full paths')