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-rw-r--r--gl/stdbool.in.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/gl/stdbool.in.h b/gl/stdbool.in.h
index e2312ecb..574c281a 100644
--- a/gl/stdbool.in.h
+++ b/gl/stdbool.in.h
@@ -50,6 +50,9 @@
with this substitute. With this substitute, only the values 0 and 1
give the expected result when converted to _Bool' or 'bool'.
+ - C99 allows the use of (_Bool)0.0 in constant expressions, but
+ this substitute cannot always provide this property.
+
Also, it is suggested that programs use 'bool' rather than '_Bool';
this isn't required, but 'bool' is more common. */