diff --git a/FAQ.md b/FAQ.md
index 8da3a77..0e10032 100644
--- a/FAQ.md
+++ b/FAQ.md
@@ -1,3 +1,7 @@
+### Does it support `compile_flags.txt`?
+
+No. https://github.com/MaskRay/ccls/issues/110
+
 ### Some C/C++ headers are not recognized
 
 #### if you are emacs user, make sure company-lsp is used
@@ -46,18 +50,6 @@ If you want to specify additional search paths:
 * `print '%clang\n%cpp -std=gnu++17\n-isystem/tmp/include' > .ccls`
 * emacs-ccls: `(setq ccls-extra-init-params '(:clang (:extraArgs ["-isystem" "/tmp/include"])))`
 
-### `-std=c++1z` `-std=c++17` `bits/unordered_map.h`
-
-In C++17 mode, it is possible to cause clang to crash when `bits/unordered_map.h` is indexed.
-See https://bugs.llvm.org/show_bug.cgi?id=37695 for details.
-The workaround is to add `-D__cpp_deduction_guides=0 -Wno-macro-redefined` to the initialization option `clang.extraArgs`
-
-In Emacs, it is:
-```elisp
-(setq ccls-extra-init-params
-  '(:clang (:extraArgs ("-D__cpp_deduction_guides=0" "-Wno-macro-redefined"))))
-```
-
 ### Project root detection
 
 [emacs-ccls](https://github.com/MaskRay/emacs-cquery/) locates the project root in the following order:
diff --git a/Getting-started.md b/Getting-started.md
index 83a5406..5142f54 100644
--- a/Getting-started.md
+++ b/Getting-started.md
@@ -75,6 +75,8 @@ Example `.ccls`:
 %clang
 %c -std=gnu11
 %cpp -std=gnu++14
+%objective-c %objective-cpp -DGNUSTEP
+%c %cpp -DFOO
 -pthread
 
 # Includes