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-rw-r--r--debug/test-strcpy_chk.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/debug/test-strcpy_chk.c b/debug/test-strcpy_chk.c
index fb9bc78d45..41eb354fa0 100644
--- a/debug/test-strcpy_chk.c
+++ b/debug/test-strcpy_chk.c
@@ -23,6 +23,9 @@
 # define TEST_NAME "strcpy_chk"
 # include "../string/test-string.h"
 
+/* This test case implicitly tests the availability of the __chk_fail
+   symbol, which is part of the public ABI and may be used
+   externally. */
 extern void __attribute__ ((noreturn)) __chk_fail (void);
 char *simple_strcpy_chk (char *, const char *, size_t);
 extern char *normal_strcpy (char *, const char *, size_t)