diff --git a/Lib/fontTools/ttLib/tables/_f_p_g_m.py b/Lib/fontTools/ttLib/tables/_f_p_g_m.py
index d116ff24e..6fc8efcec 100644
--- a/Lib/fontTools/ttLib/tables/_f_p_g_m.py
+++ b/Lib/fontTools/ttLib/tables/_f_p_g_m.py
@@ -23,6 +23,29 @@ class table__f_p_g_m(DefaultTable.DefaultTable):
 		self.program = program
 
 	def __bool__(self):
+		"""
+		>>> fpgm = table__f_p_g_m()
+		>>> bool(fpgm)
+		False
+		>>> p = ttProgram.Program()
+		>>> fpgm.program = p
+		>>> bool(fpgm)
+		False
+		>>> bc = bytearray([0])
+		>>> p.fromBytecode(bc)
+		>>> bool(fpgm)
+		True
+		>>> p.bytecode.pop()
+		0
+		>>> bool(fpgm)
+		False
+		"""
 		return hasattr(self, 'program') and bool(self.program)
 
 	__nonzero__ = __bool__
+
+
+if __name__ == "__main__":
+	import sys
+	import doctest
+	sys.exit(doctest.testmod().failed)
diff --git a/Lib/fontTools/ttLib/tables/ttProgram.py b/Lib/fontTools/ttLib/tables/ttProgram.py
index f1f62e565..12f42724b 100644
--- a/Lib/fontTools/ttLib/tables/ttProgram.py
+++ b/Lib/fontTools/ttLib/tables/ttProgram.py
@@ -449,6 +449,29 @@ class Program(object):
 		self.assembly = assembly
 
 	def __bool__(self):
+		"""
+		>>> p = Program()
+		>>> bool(p)
+		False
+		>>> bc = array.array("B", [0])
+		>>> p.fromBytecode(bc)
+		>>> bool(p)
+		True
+		>>> p.bytecode.pop()
+		0
+		>>> bool(p)
+		False
+
+		>>> p = Program()
+		>>> asm = ['SVTCA[0]']
+		>>> p.fromAssembly(asm)
+		>>> bool(p)
+		True
+		>>> p.assembly.pop()
+		'SVTCA[0]'
+		>>> bool(p)
+		False
+		"""
 		return ((hasattr(self, 'assembly') and len(self.assembly) > 0) or
 			    (hasattr(self, 'bytecode') and len(self.bytecode) > 0))