diff --git a/doc/src/Howto_tip4p.rst b/doc/src/Howto_tip4p.rst
index 7912557e61..0a263499cc 100644
--- a/doc/src/Howto_tip4p.rst
+++ b/doc/src/Howto_tip4p.rst
@@ -239,7 +239,7 @@ rigid/nvt/small can identify rigid bodies by their molecule ID:
 
    1    0.00000  -0.06556   0.00000
    2    0.75695   0.52032   0.00000
-   2   -0.75695   0.52032   0.00000
+   3   -0.75695   0.52032   0.00000
    4    0.00000   0.08444   0.00000
 
    Types