Nits on manual.

gifsicle.1

@@ -1052,35 +1052,37 @@ is on and the colormap is changed, combinations of colors are used to
 approximate missing colors. This looks better, but makes bigger files
 and can cause animation artifacts, so it is off by default.
 .Sp
-Specify a dithering algorithm with the optional \fImethod\fR argument.
-The default,
+Specify a dithering method with the optional \fImethod\fR argument.
+The default method,
 .RB \(oq floyd-steinberg \(cq,
 uses Floyd-Steinberg error
 diffusion. This usually looks best, but can cause animation artifacts,
-because dithering choices will vary from frame to frame. Gifsicle also
-supports ordered dithering algorithms that avoid animation artifacts.
-.RB \(oq atkinson \(cq,
-uses Atkinson error diffusion, which is a variant of Floyd-Steinberg.
+because dithering choices will vary from frame to frame.
+The
+.RB \(oq atkinson \(cq
+method uses Atkinson error diffusion, which is a variant of Floyd-Steinberg.
 It offers a more localized dithering pattern, which can be useful for
 images with large areas of solid color.
+Gifsicle also
+supports ordered dithering methods that avoid animation artifacts.
 The
 .RB \(oq ro64 \(cq
-mode uses a
+method uses a
 large, random-looking pattern and generally produces good results. The
 .RB \(oq o3 \(cq,
 .RB \(oq o4 \(cq,
 and
 .RB \(oq o8 \(cq
-modes use smaller, more
+methods use smaller, more
 regular patterns. The
 .RB \(oq ordered \(cq
-mode chooses a good ordered
-dithering algorithm. For special effects, try the halftone modes
+method chooses a good ordered
+dithering algorithm. For special effects, try the halftone methods
 .RB \(oq halftone \(cq,
 .RB \(oq squarehalftone \(cq,
 and
 .RB \(oq diagonal \(cq.
-Some modes take optional parameters using commas. The halftone modes
+Some methods take optional parameters using commas. The halftone methods
 take a cell size and a color limit:
 .RB \(oq halftone,10,3 \(cq
 creates 10-pixel wide halftone cells where each cell uses up to 3

src/quantize.c

@@ -1242,7 +1242,7 @@ colormap_image_atkinson(Gif_Image *gfi, uint8_t *all_new_data,
     for (k = 0; k < 3; ++k)
         err[0][i].a[k] = random_values[ (j + k) % N_RANDOM_VALUES ];
   }
-  
+
   kd3_build_xradius(kd3);
 
   /* Do the image! */