--- wikisrc/pkgsrc/hardening.mdwn	2016/03/17 03:14:51	1.3
+++ wikisrc/pkgsrc/hardening.mdwn	2016/03/17 03:19:17	1.4
@@ -53,6 +53,24 @@ scenarios are essentially possible:
 * actual bug in the program crashing, exposed thanks to ASLR/mprotect;
 * bug in the implementation of ASLR/mprotect in the Operating System.
 
+## Problems with `PKGSRC_USE_FORTIFY`
+
+### Packages failing to build
+
+This feature makes use of pre-processing directives to look for hardened,
+alternative implementations of essential library calls. Some programs may fail
+to build as a result; this usually happens for those trying too hard to be
+portable, or otherwise abusing definitions in the standard library.
+
+This will require a modification to the program, or disabling this feature for
+part or all of the build.
+
+### Run-time crashes
+
+Just like with `PKGSRC_MKPIE` above, this feature may cause some programs to
+crash, usually indicating an actual bug in the program. The fix will typically
+involve patching the original program.
+
 ## Problems with `PKGSRC_USE_SSP`
 
 ### Packages failing to build
@@ -70,7 +88,6 @@ for part or all of the build.
 
 ### Run-time crashes
 
-Just like with `PKGSRC_MKPIE` above, this feature may cause some programs to
-crash, usually indicating an actual bug in the program. The fix will typically
-involve patching the original program.
+Again, this feature may cause some programs to crash, usually indicating an
+actual bug in the program. Patching the original program is then required.