diff --git a/opentelemetry-api/src/opentelemetry/trace/sampling.py b/opentelemetry-api/src/opentelemetry/trace/sampling.py
index 4181ea5ad5d..2a2d201578a 100644
--- a/opentelemetry-api/src/opentelemetry/trace/sampling.py
+++ b/opentelemetry-api/src/opentelemetry/trace/sampling.py
@@ -132,7 +132,7 @@ class ProbabilitySampler(Sampler):
     while also respecting the parent span sampling decision.
 
     Args:
-        rate: Probability (between 0 and 1) that a span will be sampled
+        rate: Probability (between 0 and 1 inclusive) that a span will be sampled
     """
 
     def __init__(self, rate: float):