Index: source/blender/editors/mesh/editmesh_add.c
===================================================================
--- source/blender/editors/mesh/editmesh_add.c	(revision 23926)
+++ source/blender/editors/mesh/editmesh_add.c	(working copy)
@@ -1415,7 +1415,8 @@
 {
 	make_prim_ext(C, PRIM_CYLINDER, RNA_int_get(op->ptr, "vertices"), 0, 0,
 			RNA_float_get(op->ptr,"radius"),
-			RNA_float_get(op->ptr, "depth"), 1, 1);
+			RNA_float_get(op->ptr, "depth"), 1, 
+			RNA_boolean_get(op->ptr, "cap_ends"));
 
 	return OPERATOR_FINISHED;
 }
@@ -1438,6 +1439,7 @@
 	RNA_def_int(ot->srna, "vertices", 32, INT_MIN, INT_MAX, "Vertices", "", 2, 500);
 	RNA_def_float(ot->srna, "radius", 1.0f, 0.0, FLT_MAX, "Radius", "", 0.001, 100.00);
 	RNA_def_float(ot->srna, "depth", 1.0f, 0.0, FLT_MAX, "Depth", "", 0.001, 100.00);
+	RNA_def_boolean(ot->srna, "cap_ends", 1, "Cap Ends", "");
 }
 
 static int add_primitive_tube_exec(bContext *C, wmOperator *op)