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-rw-r--r--src/sort.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/sort.c b/src/sort.c
index b1948f20b..399b9644d 100644
--- a/src/sort.c
+++ b/src/sort.c
@@ -518,7 +518,7 @@ effect, characters in a field are counted from the beginning of the preceding\n\
whitespace. OPTS is one or more single-letter ordering options [bdfgiMhnRrV],\
\n\
which override global ordering options for that key. If no key is given, use\n\
-the entire line as the key.\n\
+the entire line as the key. Use --debug to diagnose incorrect key usage.\n\
\n\
SIZE may be followed by the following multiplicative suffixes:\n\
"), stdout);