diff --git a/README.md b/README.md
index d5144f0..ee9ef19 100644
--- a/README.md
+++ b/README.md
@@ -49,7 +49,7 @@ top.activate()
 top.deactivate()
 ```
 
-Activation array of constrains is more efficient than activating each constraint individually.
+Activation array of constraints is more efficient than activating each constraint individually.
 
 ```swift
 Pin.activate([
@@ -90,19 +90,19 @@ override func viewDidLoad() {
 ### Priority
 
 ```swift
-// Set priority for each constrain
+// Set priority for each constraint
 titleLabel.pin
     .start().priority(.defaultHeight)
     .end().priority(.defaultLow)
 
-// Set priority for all constrains
+// Set priority for all constraints
 titleLabel.pin.start().end().priorityForAll(.defaultHeight)
 ```
 
-### Access to NSLayoutConstrain
+### Access to NSLayoutConstraint
 
 ```swift
-let start = titleLabel.pin.start().constrains.last
+let start = titleLabel.pin.start().constraints.last
 start.constant = 30
 start.isActive = true
 ```
diff --git a/Sources/Pin/Pin.swift b/Sources/Pin/Pin.swift
index fe61ebe..3278814 100644
--- a/Sources/Pin/Pin.swift
+++ b/Sources/Pin/Pin.swift
@@ -11,7 +11,7 @@ public final class Pin {
         self.view = view
     }
     
-    public var constrains = [NSLayoutConstraint]()
+    public var constraints = [NSLayoutConstraint]()
     
     public func add(
         attr attr1: NSLayoutConstraint.Attribute,
@@ -23,7 +23,7 @@ public final class Pin {
         safe: Bool = false
     ) -> Self {
         let to = to ?? superview
-        let constrain = NSLayoutConstraint(
+        let constraint = NSLayoutConstraint(
             item: view,
             attribute: attr1,
             relatedBy: relation,
@@ -32,12 +32,12 @@ public final class Pin {
             multiplier: 1,
             constant: constant
         )
-        constrain.priority = priority
-        return add(constrain)
+        constraint.priority = priority
+        return add(constraint)
     }
     
     public func add(_ constraint: NSLayoutConstraint) -> Self {
-        constrains.append(constraint)
+        constraints.append(constraint)
         return self
     }
     
@@ -118,12 +118,12 @@ public final class Pin {
     }
     
     public func prorityForAll(_ priority: UILayoutPriority) -> Self {
-        constrains.forEach { $0.priority =  priority }
+        constraints.forEach { $0.priority =  priority }
         return self
     }
     
     public func prority(_ priority: UILayoutPriority) -> Self {
-        if let last = constrains.last { last.priority = priority }
+        if let last = constraints.last { last.priority = priority }
         return self
     }
     
@@ -135,19 +135,19 @@ public final class Pin {
     }
     
     public func activate() {
-        NSLayoutConstraint.activate(constrains)
+        NSLayoutConstraint.activate(constraints)
     }
     
     public func deactivate() {
-        NSLayoutConstraint.deactivate(constrains)
+        NSLayoutConstraint.deactivate(constraints)
     }
     
     public static func activate(_ all: [Pin]) {
-        NSLayoutConstraint.activate(all.flatMap { $0.constrains })
+        NSLayoutConstraint.activate(all.flatMap { $0.constraints })
     }
     
     public static func deactivate(_ all: [Pin]) {
-        NSLayoutConstraint.deactivate(all.flatMap { $0.constrains })
+        NSLayoutConstraint.deactivate(all.flatMap { $0.constraints })
     }
     
 }