diff --git a/glibc-RHEL-46740.patch b/glibc-RHEL-46740.patch
new file mode 100644
index 0000000..af9daae
--- /dev/null
+++ b/glibc-RHEL-46740.patch
@@ -0,0 +1,58 @@
+commit dcad78507433a9a64b8b548b19e110933f8d939a
+Author: DJ Delorie <dj@redhat.com>
+Date:   Thu Oct 10 17:16:35 2024 -0400
+
+    manual: Document stdio.h functions that may be macros
+    
+    Glibc has two gnu-extension functions that are implemented as
+    macros but not documented as such: fread_unlocked and
+    fwrite_unlocked.  Document them as such.
+    
+    Additionally, putc_unlocked and getc_unlocked are documented in
+    POSIX as possibly being macros.  Update the manual to add a warning
+    about those also, depite glibc not implementing them as macros.
+
+diff --git a/manual/stdio.texi b/manual/stdio.texi
+index 98da13de32f49c7c..01fa2d0ffdbd6f5f 100644
+--- a/manual/stdio.texi
++++ b/manual/stdio.texi
+@@ -929,6 +929,9 @@ Therefore, @var{stream} should never be an expression with side-effects.
+ @safety{@prelim{}@mtsafe{@mtsrace{:stream}}@asunsafe{@asucorrupt{}}@acunsafe{@acucorrupt{}}}
+ The @code{putc_unlocked} function is equivalent to the @code{putc}
+ function except that it does not implicitly lock the stream.
++Like @code{putc}, it may be implemented as a macro and may evaluate
++the @var{stream} argument more than once.  Therefore, @var{stream}
++should not be an expression with side-effects.
+ @end deftypefun
+ 
+ @deftypefun wint_t putwc_unlocked (wchar_t @var{wc}, FILE *@var{stream})
+@@ -1132,6 +1135,9 @@ Therefore, @var{stream} should never be an expression with side-effects.
+ @safety{@prelim{}@mtsafe{@mtsrace{:stream}}@asunsafe{@asucorrupt{}}@acunsafe{@acucorrupt{}}}
+ The @code{getc_unlocked} function is equivalent to the @code{getc}
+ function except that it does not implicitly lock the stream.
++Like @code{getc}, it may be implemented as a macro and may evaluate
++the @var{stream} argument more than once.  Therefore, @var{stream}
++should not be an expression with side-effects.
+ @end deftypefun
+ 
+ @deftypefun wint_t getwc_unlocked (FILE *@var{stream})
+@@ -1571,6 +1577,9 @@ The @code{fread_unlocked} function is equivalent to the @code{fread}
+ function except that it does not implicitly lock the stream.
+ 
+ This function is a GNU extension.
++This function may be implemented as a macro and may evaluate
++@var{stream} more than once.  Therefore, @var{stream} should not be an
++expression with side-effects.
+ @end deftypefun
+ 
+ @deftypefun size_t fwrite (const void *@var{data}, size_t @var{size}, size_t @var{count}, FILE *@var{stream})
+@@ -1589,6 +1598,9 @@ The @code{fwrite_unlocked} function is equivalent to the @code{fwrite}
+ function except that it does not implicitly lock the stream.
+ 
+ This function is a GNU extension.
++This function may be implemented as a macro and may evaluate
++@var{stream} more than once.  Therefore, @var{stream} should not be an
++expression with side-effects.
+ @end deftypefun
+ 
+ @node Formatted Output
diff --git a/glibc.spec b/glibc.spec
index 36d9d8d..3d10fa9 100644
--- a/glibc.spec
+++ b/glibc.spec
@@ -1043,6 +1043,7 @@ Patch735: glibc-RHEL-56540-1.patch
 Patch736: glibc-RHEL-56540-2.patch
 Patch737: glibc-RHEL-56540-3.patch
 Patch738: glibc-RHEL-58671.patch
+Patch739: glibc-RHEL-46740.patch
 
 ##############################################################################
 # Continued list of core "glibc" package information:
@@ -3048,6 +3049,7 @@ update_gconv_modules_cache ()
 - Backport test implementation to verify rewinddir behavior
   (RHEL-56540)
 - Backport elf/tst-startup-errno test (RHEL-58671)
+- Backport: Identify unsafe macros in the glibc documentation (RHEL-46740)
 
 * Thu Dec 19 2024 DJ Delorie <dj@redhat.com> - 2.34-148
 - Increase ungetc test coverage, guarantee single char pushback (RHEL-46738)