added some comments
diff --git a/src/sfnt/sfconfig.h b/src/sfnt/sfconfig.h
index 0c16b9d..5caa2cc 100644
--- a/src/sfnt/sfconfig.h
+++ b/src/sfnt/sfconfig.h
@@ -42,9 +42,17 @@
/* load and enumerate the glyph Postscript names in a TrueType or */
/* OpenType file. */
/* */
+ /* Note that if FT_CONFIG_OPTION_POSTSCRIPT_NAMES is also defined, */
+ /* the TrueType driver will use the "psnames" module to fetch the */
+ /* glyph names. */
+ /* */
+ /* Otherwise, the driver will provide its own set of glyph names to */
+ /* be built without the "psnames" module. */
+ /* */
#define TT_CONFIG_OPTION_POSTSCRIPT_NAMES
+
#endif /* SFCONFIG_H */