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-rw-r--r--Src/utils.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/Src/utils.c b/Src/utils.c
index 6815f3cc4..19b5ab011 100644
--- a/Src/utils.c
+++ b/Src/utils.c
@@ -1844,7 +1844,7 @@ zstrtol(const char *s, char **t, int base)
     }
     inp = s;
     if (base < 2 || base > 36) {
-	zerr("invalid base: %d", base);
+	zerr("invalid base (must be 2 to 36 inclusive): %d", base);
 	return (zlong)0;
     } else if (base <= 10)
 	for (; *s >= '0' && *s < ('0' + base); s++) {