diff --git a/l1/1.jl b/l1/1.jl
index 69b15d8..0c53aa9 100755
--- a/l1/1.jl
+++ b/l1/1.jl
@@ -9,9 +9,9 @@ Calculate the machine epsilon iteratively
 for the given IEEE 754 floating point type.
 
 # Arguments
-- `T`: a floating point number type <: AbstractFloat
+- `T`: the floating point type
 """
-function macheps(T)
+function macheps(T::Type{<: AbstractFloat})
     one_T = one(T)
     ret = one_T
     while one_T + (ret / T(2)) > one_T
@@ -28,9 +28,9 @@ Calculate the eta number iteratively
 for the given IEEE 754 floating point type.
 
 # Arguments
-- `T`: a floating point number type <: AbstractFloat
+- `T`: the floating point type
 """
-function eta(T)
+function eta(T::Type{<: AbstractFloat})
     ret = one(T)
 
     while ret / T(2) > zero(T)
@@ -47,9 +47,9 @@ Calculate the largest possible value
 for the given IEEE 754 floating type.
 
 # Arguments
-- `T`: a floating point number type <: AbstractFloat
+- `T`: the floating point type
 """
-function max(T)
+function max(T::Type{<: AbstractFloat})
     ret = one(T)
 
     while isfinite(ret * T(2))