diff --git a/doc/src/manifolds.txt b/doc/src/manifolds.txt
index 9f0082d5dc..c9bb1ce57f 100644
--- a/doc/src/manifolds.txt
+++ b/doc/src/manifolds.txt
@@ -24,14 +24,15 @@ to the relevant fixes.
 {manifold} @ {parameters} @ {equation} @ {description}
 cylinder @ R @ x^2 + y^2 - R^2 = 0 @ Cylinder along z-axis, axis going through (0,0,0)
 cylinder_dent @ R l a @ x^2 + y^2 - r(z)^2 = 0, r(x) = R if | z | > l, r(z) = R - a*(1 + cos(z/l))/2 otherwise @ A cylinder with a dent around z = 0
-dumbbell @ a A B c @ -( x^2 + y^2 ) * (a^2 - z^2/c^2) * ( 1 + (A*sin(B*z^2))^4) = 0 @ A dumbbell @
+dumbbell @ a A B c @ -( x^2 + y^2 ) + (a^2 - z^2/c^2) * ( 1 + (A*sin(B*z^2))^4) = 0 @ A dumbbell
 ellipsoid @ a  b c @ (x/a)^2 + (y/b)^2 + (z/c)^2 = 0 @ An ellipsoid
+gaussian_bump @ A l rc1 rc2 @ if( x < rc1) -z + A * exp( -x^2 / (2 l^2) ); else if( x < rc2 ) -z + a + b*x + c*x^2 + d*x^3; else z @ A Gaussian bump at x = y = 0, smoothly tapered to a flat plane z = 0.
 plane @ a b c x0 y0 z0 @ a*(x-x0) + b*(y-y0) + c*(z-z0) = 0 @ A plane with normal (a,b,c) going through point (x0,y0,z0)
 plane_wiggle @ a w @ z - a*sin(w*x) = 0 @ A plane with a sinusoidal modulation on z along x.
 sphere @ R @ x^2 + y^2 + z^2 - R^2 = 0 @ A sphere of radius R
 supersphere @ R q @ | x |^q + | y |^q + | z |^q - R^q = 0 @ A supersphere of hyperradius R
-spine @ a, A, B, B2, c @ -(x^2 + y^2)*(a^2 - z^2/f(z)^2)*(1 + (A*sin(g(z)*z^2))^4), f(z) = c if z > 0, 1 otherwise; g(z) = B if z > 0, B2 otherwise  @ An approximation to a dendtritic spine
-spine_two @ a, A, B, B2, c @ -(x^2 + y^2)*(a^2 - z^2/f(z)^2)*(1 + (A*sin(g(z)*z^2))^2), f(z) = c if z > 0, 1 otherwise; g(z) = B if z > 0, B2 otherwise  @ Another approximation to a dendtritic spine
+spine @ a, A, B, B2, c @ -(x^2 + y^2) + (a^2 - z^2/f(z)^2)*(1 + (A*sin(g(z)*z^2))^4), f(z) = c if z > 0, 1 otherwise; g(z) = B if z > 0, B2 otherwise  @ An approximation to a dendtritic spine
+spine_two @ a, A, B, B2, c @ -(x^2 + y^2) + (a^2 - z^2/f(z)^2)*(1 + (A*sin(g(z)*z^2))^2), f(z) = c if z > 0, 1 otherwise; g(z) = B if z > 0, B2 otherwise  @ Another approximation to a dendtritic spine
 thylakoid @ wB LB lB @ Various, see "(Paquay)"_#Paquay1 @ A model grana thylakoid consisting of two block-like compartments connected by a bridge of width wB, length LB and taper length lB
 torus @ R r  @  (R - sqrt( x^2 + y^2 ) )^2 + z^2 - r^2  @ A torus with large radius R and small radius r, centered on (0,0,0) :tb(s=@)
 
diff --git a/src/USER-MANIFOLD/manifold.h b/src/USER-MANIFOLD/manifold.h
index d0ffa214ac..b89e765a6e 100644
--- a/src/USER-MANIFOLD/manifold.h
+++ b/src/USER-MANIFOLD/manifold.h
@@ -24,7 +24,7 @@
    testing purposes) and a wave-y plane.
    See the README file for more info.
 
-   Stefan Paquay, s.paquay@tue.nl
+   Stefan Paquay, stefanpaquay@gmail.com
    Applied Physics/Theory of Polymers and Soft Matter,
    Eindhoven University of Technology (TU/e), The Netherlands
 
diff --git a/src/USER-MANIFOLD/manifold_gaussian_bump.h b/src/USER-MANIFOLD/manifold_gaussian_bump.h
index 43f69fba18..f3401a4a33 100644
--- a/src/USER-MANIFOLD/manifold_gaussian_bump.h
+++ b/src/USER-MANIFOLD/manifold_gaussian_bump.h
@@ -24,7 +24,10 @@
    testing purposes) and a wave-y plane.
    See the README file for more info.
 
-   Stefan Paquay, s.paquay@tue.nl
+   Stefan Paquay, spaquay@brandeis.edu
+   Brandeis University, Waltham, MA, USA.
+
+   This package was mainly developed at
    Applied Physics/Theory of Polymers and Soft Matter,
    Eindhoven University of Technology (TU/e), The Netherlands