diff --git a/Debugging.md b/Debugging.md
index 81d7583..5c41208 100644
--- a/Debugging.md
+++ b/Debugging.md
@@ -24,6 +24,15 @@ You can find stderr output in:
   `*message*` buffer if `(setq lsp-log-io t)`
 * VSCode: TODO
 
+### Indexer issues
+
+`export CCLS_CRASH_RECOVERY=0` disables clang crash recovery. In case of
+clangIndex issues, you will not see `clang crashed` in the log file but get a
+process crash. And if you attach a debugger before it crashes, you can get the
+stack trace.
+
+`gdb --args /path/to/ccls -index=/path/to/project`
+
 ### Dump LSP requests/responses
 
 On Linux:
@@ -73,13 +82,6 @@ Use `CCLS_TRACEME=s` to `raise(SIGSTOP)`, if `SIGTSTP` does not work.
   resumes (with a `c` command) if you want ccls to continue running after
   detaching.
 
-### Indexer issues
-
-`export CCLS_CRASH_RECOVERY=0` disables clang crash recovery. In case of
-clangIndex issues, you will not see `clang crashed` in the log file but get a
-process crash. And if you attach a debugger before it crashes, you can get the
-stack trace.
-
 ## Developing
 
 ### Diagnose whether requests are handled correctly