diff --git a/src/exiv2.1 b/src/exiv2.1
index 49ebf607..2eda7d8b 100644
--- a/src/exiv2.1
+++ b/src/exiv2.1
@@ -427,7 +427,7 @@ The format for \fBRational\fP (and \fBSRational\fP) is one of:
 .br
     integer
 .br
-    integer-numerator,integer-denominator
+    integer-numerator/integer-denominator
 .br
     Fnumber
 .br