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-rw-r--r--INSTALL3
1 files changed, 3 insertions, 0 deletions
diff --git a/INSTALL b/INSTALL
index 7f604a27a..783aea57c 100644
--- a/INSTALL
+++ b/INSTALL
@@ -326,6 +326,9 @@ This enables the builtin "hashinfo".
 To add some sanity checks and generate debugging information for debuggers
 you can use the following option.  This also disables optimization.
  --enable-zsh-debug            # use it if you want to debug zsh
+In this mode, zsh may output extra information about internal errors
+to stderr.  The shell variable ZSH_DEBUG_LOG may be set to another file
+to which errors will be appended.
 
 Startup/shutdown files
 ----------------------