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-rw-r--r--Src/math.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/Src/math.c b/Src/math.c
index 3374efddd..5b6941953 100644
--- a/Src/math.c
+++ b/Src/math.c
@@ -461,7 +461,8 @@ zzlex(void)
 		if(*ptr != ']')
 			goto bofs;
 		if (outputradix < 2 || outputradix > 36) {
-		    zerr("invalid base: %d", outputradix);
+		    zerr("invalid base (must be 2 to 36 inclusive): %d",
+			 outputradix);
 		    return EOI;
 		}
 		ptr++;