diff --git a/configure.ac b/configure.ac
index 53886ea6b26b8ed5ea72e1b6c4f85c10a31fc7fc..c0ce630351f471de337d73a0f401227a91a38dc2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1797,7 +1797,7 @@ esac
 #  External potential
 AC_ARG_WITH([ext-potential],
    [AS_HELP_STRING([--with-ext-potential=<pot>],
-      [external potential @<:@none, point-mass, point-mass-ring, point-mass-softened, isothermal, softened-isothermal, nfw, hernquist, disc-patch, sine-wave, default: none@:>@]
+      [external potential @<:@none, point-mass, point-mass-ring, point-mass-softened, isothermal, nfw, hernquist, disc-patch, sine-wave, default: none@:>@]
    )],
    [with_potential="$withval"],
    [with_potential="none"]