diff --git a/src/gl/models/gl_models.cpp b/src/gl/models/gl_models.cpp
index 7a5e686be..768690bcc 100644
--- a/src/gl/models/gl_models.cpp
+++ b/src/gl/models/gl_models.cpp
@@ -1003,12 +1003,12 @@ void gl_RenderModel(GLSprite * spr)
 	}
 
 	// Added MDL_USEACTORPITCH and MDL_USEACTORROLL flags processing.
-	// If both flags MDL_USEACTORPITCH and MDL_PITCHFROMMOMENTUM are set, the pitch sums up the actor pitch and the momentum vector pitch.
+	// If both flags MDL_USEACTORPITCH and MDL_PITCHFROMMOMENTUM are set, the pitch sums up the actor pitch and the velocity vector pitch.
 	if (smf->flags & MDL_USEACTORPITCH)
 	{
 		double d = spr->actor->Angles.Pitch.Degrees;
-		if (smf->flags & MDL_BADROTATION) pitch -= d;
-		else pitch += d;
+		if (smf->flags & MDL_BADROTATION) pitch += d;
+		else pitch -= d;
 	}
 	if(smf->flags & MDL_USEACTORROLL) roll += spr->actor->Angles.Roll.Degrees;