diff --git a/libs/pbd/pbd/controllable.h b/libs/pbd/pbd/controllable.h
index 4168bbc2a0..51aa28a4fe 100644
--- a/libs/pbd/pbd/controllable.h
+++ b/libs/pbd/pbd/controllable.h
@@ -67,12 +67,12 @@ class LIBPBD_API Controllable : public PBD::StatefulDestructible {
 	 * (in order to make controls behave logarithmically).
 	 * 3. `internal' --- as passed to a processor, track, plugin, or whatever.
 	 *
-	 * Note that in some cases user and processor may be the same
+	 * Note that in some cases user and internal may be the same
 	 * (and interface different) e.g. frequency, which is presented
 	 * to the user and passed to the processor in linear terms, but
 	 * which needs log scaling in the interface.
 	 *
-	 * In other cases, user and interface may be the same (and processor different)
+	 * In other cases, user and interface may be the same (and internal different)
 	 * e.g. gain, which is presented to the user in log terms (dB)
 	 * but passed to the processor as a linear quantity.
 	 */