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-rw-r--r--src/src/tls-gnu.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/src/tls-gnu.c b/src/src/tls-gnu.c
index 898e37cd6..527ad28b2 100644
--- a/src/src/tls-gnu.c
+++ b/src/src/tls-gnu.c
@@ -221,7 +221,8 @@ static BOOL gnutls_buggy_ocsp = FALSE;
/* Set this to control gnutls_global_set_log_level(); values 0 to 9 will setup
the library logging; a value less than 0 disables the calls to set up logging
-callbacks. */
+callbacks. Possibly GNuTLS also looks for an environment variable
+"GNUTLS_DEBUG_LEVEL". */
#ifndef EXIM_GNUTLS_LIBRARY_LOG_LEVEL
# define EXIM_GNUTLS_LIBRARY_LOG_LEVEL -1
#endif