diff --git a/src/bodies/spheres.jl b/src/bodies/spheres.jl
index e0e57a2..4ad2ce0 100644
--- a/src/bodies/spheres.jl
+++ b/src/bodies/spheres.jl
@@ -3,7 +3,7 @@ export HyperSphere, contact, is_encounter
 # dispatch hides call to Point
 HyperSphere(center::SVector{D}, radius::Real) where D = HyperSphere(Point(Float64.(center)), Float64(radius))
 
-@inline position(a::HyperSphere{D}) where D = SVector{D}(a.center)
+@inline Base.position(a::HyperSphere{D}) where D = SVector{D}(a.center)
 #@inline radius(a::AbstractMicrobe) = a.radius
 @inline radius(a::HyperSphere) = a.r
 @inline contact(a,b,model) = distance(a,b,model) ≤ radius(a) + radius(b)
diff --git a/src/chemotaxis/brumley.jl b/src/chemotaxis/brumley.jl
index 98c94f7..09310b0 100644
--- a/src/chemotaxis/brumley.jl
+++ b/src/chemotaxis/brumley.jl
@@ -7,7 +7,7 @@ The model is optimized for simulation of marine bacteria and accounts
 for the presence of (gaussian) sensing noise in the chemotactic pathway.
 
 Default parameters:
-- `motility = RunReverseFlick(speed_forward = [46.5])`
+- `motility = RunReverseFlick(speed = [46.5])`
 - `turn_rate = 2.22` Hz → '1/τ₀'
 - `state = 0.0` → 'S'
 - `rotational_diffusivity = 0.035` rad²/s
@@ -19,7 +19,7 @@ Default parameters:
 """
 @agent struct Brumley{D}(ContinuousAgent{D,Float64}) <: AbstractMicrobe{D}
     speed::Float64
-    motility = RunReverseFlick(speed_forward = [46.5])
+    motility = RunReverseFlick(speed = [46.5])
     turn_rate::Float64 = 1 / 0.45
     rotational_diffusivity::Float64 = 0.035
     radius::Float64 = 0.5
diff --git a/src/chemotaxis/xie.jl b/src/chemotaxis/xie.jl
index b79bdbd..7e817ea 100644
--- a/src/chemotaxis/xie.jl
+++ b/src/chemotaxis/xie.jl
@@ -14,7 +14,7 @@ tuned through a `chemotactic_precision` factor inspired by
 'Brumley et al. (2019) PNAS' (defaults to 0, i.e. no noise).
 
 Default parameters:
-- `motility = RunReverseFlick(speed_forward = [46.5])`
+- `motility = RunReverseFlick(speed = [46.5])`
 - `turn_rate_forward = 2.3` Hz
 - `turn_rate_backward = 1.9` Hz
 - `state = 0.0` s