diff --git a/TODO b/TODO
index cdc0075b..21bfa881 100644
--- a/TODO
+++ b/TODO
@@ -1,13 +1,4 @@
-- try
-
-	$ vips im_point kylie110.jpg bilinear 0 0 0 
-	(vips:8895): GLib-GObject-WARNING **: invalid unclassed pointer in cast to
-	`VipsInterpolate'
-	Segmentation fault
-
-  how odd
-
-- im_maxpos_vec needs gtkdoc
+- im_lintra(), im_maxpos_vec(), im_minpos_vec(), im_linreg() need gtkdoc
 
 
 
diff --git a/libvips/arithmetic/im_point_bilinear.c b/libvips/arithmetic/im_point_bilinear.c
index 2ce2274a..4bf818ea 100644
--- a/libvips/arithmetic/im_point_bilinear.c
+++ b/libvips/arithmetic/im_point_bilinear.c
@@ -59,7 +59,7 @@
  * @out: return interpolated value
  *
  * Find the value at (@x, @y) in given band of image.
- * Use bilinear interpolation if @x or @y are non-integral. 
+ * Non-integral values are calculated using the supplied @interpolate.
  *
  * See also: im_avg(), #VipsInterpolate
  *
diff --git a/libvips/arithmetic/im_powtra.c b/libvips/arithmetic/im_powtra.c
index 010f4092..b993502e 100644
--- a/libvips/arithmetic/im_powtra.c
+++ b/libvips/arithmetic/im_powtra.c
@@ -239,7 +239,7 @@ im_powtra_vec( IMAGE *in, IMAGE *out, int n, double *e )
 }
 
 /**
- * im_powntra:
+ * im_powtra:
  * @in: input #IMAGE 
  * @out: output #IMAGE
  * @e: exponent
diff --git a/libvips/include/vips/arithmetic.h b/libvips/include/vips/arithmetic.h
index 97311682..0119a73f 100644
--- a/libvips/include/vips/arithmetic.h
+++ b/libvips/include/vips/arithmetic.h
@@ -84,10 +84,6 @@ int im_tantra( IMAGE *in, IMAGE *out );
 int im_asintra( IMAGE *in, IMAGE *out );
 int im_acostra( IMAGE *in, IMAGE *out );
 int im_atantra( IMAGE *in, IMAGE *out );
-int im_cmulnorm( IMAGE *in1, IMAGE *in2, IMAGE *out );
-int im_fav4( IMAGE **, IMAGE * );
-int im_gadd( double, IMAGE *, double, IMAGE *, double, IMAGE *);
-int im_litecor( IMAGE *, IMAGE *, IMAGE *, int, double );
 int im_bandmean( IMAGE *in, IMAGE *out );
 int im_cross_phase( IMAGE *a, IMAGE *b, IMAGE *out );
 
diff --git a/libvips/include/vips/deprecated.h b/libvips/include/vips/deprecated.h
index 71e1f53e..b95348d6 100644
--- a/libvips/include/vips/deprecated.h
+++ b/libvips/include/vips/deprecated.h
@@ -307,6 +307,13 @@ typedef struct {
  */
 typedef VipsDemandType im_demand_type;
 
+/* Deprecated operations.
+ */
+int im_cmulnorm( IMAGE *in1, IMAGE *in2, IMAGE *out );
+int im_fav4( IMAGE **, IMAGE * );
+int im_gadd( double, IMAGE *, double, IMAGE *, double, IMAGE *);
+int im_litecor( IMAGE *, IMAGE *, IMAGE *, int, double );
+
 #ifdef __cplusplus
 }
 #endif /*__cplusplus*/