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-rw-r--r--manual/math.texi4
1 files changed, 4 insertions, 0 deletions
diff --git a/manual/math.texi b/manual/math.texi
index 8520de4835..945ba50d43 100644
--- a/manual/math.texi
+++ b/manual/math.texi
@@ -1730,6 +1730,10 @@ are necessary. This increases the speed significantly. But the
drawback is that the code size increases and this increase is not always
neglectable.
+The speed increase has one drawback: the inline functions might not set
+@code{errno} and might not have the same precission as the library
+functions.
+
In cases where the inline functions and macros are not wanted the symbol
@code{__NO_MATH_INLINES} should be defined before any system header is
included. This will make sure only library functions are used. Of