diff --git a/src/core/lib/transport/pid_controller.h b/src/core/lib/transport/pid_controller.h
index ecb9deedaa2b63f05928ea7136373df5fb877818..059b5b08346a48b1f9d13e9fb07584799e3a63f3 100644
--- a/src/core/lib/transport/pid_controller.h
+++ b/src/core/lib/transport/pid_controller.h
@@ -35,7 +35,7 @@
 #define GRPC_CORE_LIB_TRANSPORT_PID_CONTROLLER_H
 
 /* \file Simple PID controller.
-   Implements a proportial-integral-derivative controller.
+   Implements a proportional-integral-derivative controller.
    Used when we want to iteratively control a variable to converge some other
    observed value to a 'set-point'.
    Gains can be set to adjust sensitivity to current error (p), the integral