diff --git a/Build.md b/Build.md
index d467f64..20760ea 100644
--- a/Build.md
+++ b/Build.md
@@ -9,7 +9,7 @@ Otherwise, you'll need to build **ccls** from source.  You will need:
   * GCC 7.2 or higher (`optional,string_view` require libstdc++7 or higher)
   * MSVC 2017 or higher (included with VS2017 Build Tools)
 * On POSIX systems, either GNU make or Ninja (optional on other systems)
-* Clang+LLVM headers and libraries
+* Clang+LLVM headers and libraries, version >= 7 ([0.20181225.8](https://github.com/MaskRay/ccls/releases/tag/0.20181225.8) is the last release that supports clang 6)
 
 The simplest/quickest build with all defaults (only for POSIX systems) is:
 
diff --git a/Customization.md b/Customization.md
index 32b0835..5cda7f5 100644
--- a/Customization.md
+++ b/Customization.md
@@ -33,6 +33,8 @@ will show the compiler arguments used to index files.
 
 ## Initialization Options
 
+Initialization options are defined in [config.hh](https://github.com/MaskRay/ccls/blob/master/src/config.hh).
+
 Each language client may have its own way to specify initialization options.
 Also, initialization options can be specified on the `ccls` command line using
 the [`--init` option](#--initjson).
diff --git a/lsp-mode.md b/lsp-mode.md
index 2ac3619..bb6b5db 100644
--- a/lsp-mode.md
+++ b/lsp-mode.md
@@ -33,20 +33,10 @@ The only required configuration is `ccls-executable`. Others have good defaults.
 
 ```elisp
 (setq ccls-executable "/path/to/ccls/Release/ccls")
-;; ;; Some Linux distributions have packages that install to /usr/bin/ccls
-;; (setq ccls-executable "/usr/bin/ccls")
-
-;; ;; Log file
 ;; (setq ccls-args '("--log-file=/tmp/ccls.log"))
 ```
 
-A more flexible way is to leave `ccls-executable` unchanged (default: `ccls`) and create a shell wrapper named `ccls` that is in your `PATH`:
-```zsh
-#!/bin/zsh
-#export CCLS_TRACEME=1 # if you want to debug ccls, stop it right after main() is called
-#export LD_LIBRARY_PATH=~/llvm/Release/lib # if you link against shared library libLLVM.so, not statically
-exec ~/ccls/Release/ccls --log-file=/tmp/ccls.log "$@"
-```
+You may leave `ccls-executable` unchanged (default: `ccls`) and create a [shell script wrapper](Install#shell-script-wrapper).
 
 Some common settings to lsp-mode lsp-ui and emacs-ccls:
 
@@ -58,11 +48,13 @@ Some common settings to lsp-mode lsp-ui and emacs-ccls:
 When `M-x lsp` is invoked, projectile is consulted to locate the project root which determines the associated lsp-mode workspace.
 If your project has subprojects, `(projectile-project-root)` may think files in the subproject belong to the child workspace, which is not desired. `touch .ccls-root` in the root directory to override projectile roots.
 
-Read `lsp-project-whitelist lsp-project-blacklist` if you don't want to start ccls for some paths.
-
-
 #### flycheck
-If you are flycheck user, make sure `  (setq-default flycheck-disabled-checkers '(c/c++-clang c/c++-cppcheck c/c++-gcc))`, otherwise wrong error messages may occur.
+
+flymake is used by default.
+
+To use flycheck, `(setq lsp-prefer-flymake nil)`. You may also need `(setq-default flycheck-disabled-checkers '(c/c++-clang c/c++-cppcheck c/c++-gcc))` to disable other checkers.
+
+![](https://ptpb.pw/5KIc.jpg)
 
 ### Diagnostics
 
@@ -74,9 +66,9 @@ The buffer `*lsp-ccls stderr*` and `--log-file=/tmp/cq.log` contain logs.
 
 Also refer to [[Debugging]].
 
-## [[Initialization options|Project-Setup#InitializationOptions]]
+## [[Initialization options|Customization#initialization-options]]
 
-Initialization options are defined in [config.hh](https://github.com/MaskRay/ccls/blob/master/src/config.hh), but you need to customize them in S-exp.
+You need to customize initialization options in S-exp.
 Use `t` for true, `:json-false` for false, `:json-null` for null.
 
 ```elisp
@@ -208,10 +200,6 @@ Add `company-lsp` to `company-backends`. ccls has a fuzzy matching algorithm to
 
 ![company-lsp + company-quickhelp](https://ptpb.pw/AC6J.jpg)
 
-### lsp-ui-flycheck
-
-![](https://ptpb.pw/5KIc.jpg)
-
 ### Semantic highlighting
 
 To enable semantic highlighting: