diff --git a/src/entity/effect/Effect.php b/src/entity/effect/Effect.php
index 6e7192e2e..fe2f80bd1 100644
--- a/src/entity/effect/Effect.php
+++ b/src/entity/effect/Effect.php
@@ -90,7 +90,7 @@ class Effect{
 	}
 
 	/**
-	 * Returns the default duration this effect will apply for if a duration is not specified.
+	 * Returns the default duration (in ticks) this effect will apply for if a duration is not specified.
 	 * @return int
 	 */
 	public function getDefaultDuration() : int{
diff --git a/src/entity/effect/EffectInstance.php b/src/entity/effect/EffectInstance.php
index ee7665d38..1af2e5b6e 100644
--- a/src/entity/effect/EffectInstance.php
+++ b/src/entity/effect/EffectInstance.php
@@ -75,6 +75,8 @@ class EffectInstance{
 	}
 
 	/**
+	 * Returns the number of ticks remaining until the effect expires.
+	 *
 	 * @return int
 	 */
 	public function getDuration() : int{
@@ -82,6 +84,8 @@ class EffectInstance{
 	}
 
 	/**
+	 * Sets the number of ticks remaining until the effect expires.
+	 *
 	 * @param int $duration
 	 *
 	 * @throws \InvalidArgumentException