diff --git a/exp_util/module/include/math.lua b/exp_util/module/include/math.lua
index 69093cb0..ce1bfbcc 100644
--- a/exp_util/module/include/math.lua
+++ b/exp_util/module/include/math.lua
@@ -13,19 +13,19 @@ math.inv_sqrt2 = 1 / math.sqrt2
 math.tau = 2 * math.pi
 
 --- Rounds a number to certain number of decimal places, does not work on significant figures
--- @tparam number num The number to be rounded
--- @tparam[opt=0] number idp The number of decimal places to round to
--- @treturn number The input number rounded to the given number of decimal places
+--- @param num number The number to be rounded
+--- @param idp number? The number of decimal places to round to
+--- @return number
 math.round = function(num, idp)
     local mult = 10 ^ (idp or 0)
     return floor(num * mult + 0.5) / mult
 end
 
 --- Clamp a number better a minimum and maximum value, preserves NaN (not the same as nil)
--- @tparam number num The number to be clamped
--- @tparam number min The lower bound of the accepted range
--- @tparam number max The upper bound of the accepted range
--- @treturn number The input number clamped to the given range
+--- @param num number The number to be clamped
+--- @param min number The lower bound of the accepted range
+--- @param max number The upper bound of the accepted range
+--- @return number
 math.clamp = function(num, min, max)
     if num < min then
         return min
@@ -37,28 +37,37 @@ math.clamp = function(num, min, max)
 end
 
 --- Returns the slope / gradient of a line given two points on the line
--- @tparam number x1 The X coordinate of the first point on the line
--- @tparam number y1 The Y coordinate of the first point on the line
--- @tparam number x2 The X coordinate of the second point on the line
--- @tparam number y2 The Y coordinate of the second point on the line
--- @treturn number The slope of the line
+--- @param x1 number The X coordinate of the first point on the line
+--- @param y1 number The Y coordinate of the first point on the line
+--- @param x2 number The X coordinate of the second point on the line
+--- @param y2 number The Y coordinate of the second point on the line
+--- @return number
 math.slope = function(x1, y1, x2, y2)
     return abs((y2 - y1) / (x2 - x1))
 end
 
 --- Returns the y-intercept of a line given ibe point on the line and its slope
--- @tparam number x The X coordinate of point on the line
--- @tparam number y The Y coordinate of point on the line
--- @tparam number slope The slope / gradient of the line
--- @treturn number The y-intercept of the line
+--- @param x number The X coordinate of point on the line
+--- @param y number The Y coordinate of point on the line
+--- @param slope number The slope / gradient of the line
+--- @return number
 math.y_intercept = function(x, y, slope)
     return y - (slope * x)
 end
 
 local deg_to_rad = math.tau / 360
 --- Returns the angle x (given in radians) in degrees
+--- @param x number
+--- @return number
 math.degrees = function(x)
     return x * deg_to_rad
 end
 
+--- Returns the sign of the input value
+--- @param x number
+--- @return number
+math.sign = function(x)
+    return x < 0 and -1 or 0
+end
+
 return math