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-rw-r--r--rational.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/rational.c b/rational.c
index 0cba54e..a78b320 100644
--- a/rational.c
+++ b/rational.c
@@ -1024,10 +1024,12 @@ nurat_expt(VALUE self, VALUE other)
/*
* call-seq:
- * rat <=> numeric -> -1, 0, +1 or nil
+ * rational <=> numeric -> -1, 0, +1 or nil
*
* Performs comparison and returns -1, 0, or +1.
*
+ * +nil+ is returned if the two values are incomparable.
+ *
* Rational(2, 3) <=> Rational(2, 3) #=> 0
* Rational(5) <=> 5 #=> 0
* Rational(2,3) <=> Rational(1,3) #=> 1