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-rw-r--r--src/lisp.h7
1 files changed, 3 insertions, 4 deletions
diff --git a/src/lisp.h b/src/lisp.h
index 1941a2471a4..0da668bb87f 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -95,10 +95,9 @@ extern void die P_((const char *, const char *, int)) NO_RETURN;
#endif
#endif /* ENABLE_CHECKING */
-/* Define this to make Lisp_Object use a union type instead of the
- default int. FIXME: It might be better to add a flag to configure
- to do this. */
-/* #define USE_LISP_UNION_TYPE */
+/* Use the configure flag --enable-use-lisp-union-type to make
+ Lisp_Object use a union type instead of the default int. The flag
+ causes USE_LISP_UNION_TYPE to be defined. */
/***** Select the tagging scheme. *****/
/* There are basically two options that control the tagging scheme: