diff --git a/bin/printsizes.py b/bin/printsizes.py
new file mode 100755
index 0000000..dbe1db0
--- /dev/null
+++ b/bin/printsizes.py
@@ -0,0 +1,43 @@
+#!/usr/bin/python2
+
+## Quick little pyelftools script to test the size of a CC430F6137
+## firmware image, warning the user if it looks too big.
+
+from __future__ import print_function
+import sys
+
+
+from elftools.elf.elffile import ELFFile
+from elftools.elf.sections import SymbolTableSection
+
+
+def process_file(filename):
+    with open(filename, 'rb') as f:
+        printsizes(f)
+
+
+def printsizes(stream):
+    elffile = ELFFile(stream);
+
+    text=elffile.get_section_by_name('.text');
+    textlen=len(text.data());
+    codeperc=textlen*100.0/32768;
+    print("%d bytes of .text (%d %%)" % (textlen,codeperc));
+    if codeperc>80:
+        print("WARNING: %d percent of code is used!"%codeperc);
+    
+
+    data=elffile.get_section_by_name('.data');
+    datalen=len(data.data());
+    bss=elffile.get_section_by_name('.bss');
+    bsslen=len(bss.data());
+    dataperc=(datalen+bsslen)*100.0/8192;
+    print("%d bytes of .data, %d bytes of .bss (%d %%)"
+          %(datalen,bsslen,dataperc));
+    if dataperc>80:
+        print("WARNING: %d percent of code is used!"%codeperc);
+
+
+if __name__ == '__main__':
+    for filename in sys.argv[1:]:
+        process_file(filename)
diff --git a/firmware/Makefile b/firmware/Makefile
index a645a32..cb483f1 100644
--- a/firmware/Makefile
+++ b/firmware/Makefile
@@ -15,6 +15,8 @@ gittag.h:
 	echo "#define GITTAG" 0x`git describe --always` >gittag.h
 goodwatch: $(modules) $(apps) *.h
 	$(CC) -o goodwatch $(modules) $(apps)
+	../bin/printsizes.py goodwatch || echo "Please install python-pyelftools."
+
 goodwatch.hex: goodwatch
 	msp430-objcopy -O ihex goodwatch goodwatch.hex