diff --git a/doc/_sources/pair_mdf.txt b/doc/_sources/pair_mdf.txt
index da4153e5b7..bea38dc5e8 100644
--- a/doc/_sources/pair_mdf.txt
+++ b/doc/_sources/pair_mdf.txt
@@ -104,7 +104,7 @@ below:
 
 
 For the *buck/mdf* pair_style, the potential energy, *E(r)*, is the
-standard 12-6 Lennard-Jones written in the epsilon/sigma form:
+standard Buckingham potential:
 
 .. image:: Eqs/pair_mdf-5.jpg
    :align: center
diff --git a/doc/pair_mdf.html b/doc/pair_mdf.html
index e1219dfb89..8ab58dea99 100644
--- a/doc/pair_mdf.html
+++ b/doc/pair_mdf.html
@@ -202,7 +202,7 @@ below:</p>
 </ul>
 <hr class="docutils" />
 <p>For the <em>buck/mdf</em> pair_style, the potential energy, <em>E(r)</em>, is the
-standard 12-6 Lennard-Jones written in the epsilon/sigma form:</p>
+standard Buckingham potential:</p>
 <img alt="_images/pair_mdf-5.jpg" class="align-center" src="_images/pair_mdf-5.jpg" />
 <ul class="simple">
 <li>A (energy units)</li>
diff --git a/doc/pair_mdf.txt b/doc/pair_mdf.txt
index 191cca3e98..ca06f1bf8e 100644
--- a/doc/pair_mdf.txt
+++ b/doc/pair_mdf.txt
@@ -83,7 +83,7 @@ r_{cut} (distance units) :ul
 :line
 
 For the {buck/mdf} pair_style, the potential energy, {E(r)}, is the
-standard 12-6 Lennard-Jones written in the epsilon/sigma form:
+standard Buckingham potential:
 
 :c,image(Eqs/pair_mdf-5.jpg)