diff --git a/docs/parasites.txt b/docs/parasites.txt
index ef9cd8ba1d..00e3e0230d 100644
--- a/docs/parasites.txt
+++ b/docs/parasites.txt
@@ -54,7 +54,7 @@ gimp-brush-pipe-parameters" (IMAGE, PERSISTENT)
 	The keywords are:
 	ncells: the number of brushes in the brush pipe
 	step: the default spacing for the pipe
-	dim: the dimension of the hose. the number of cells
+	dim: the dimension of the pipe. The number of cells
 		in the pipe should be equal to the product
 		of the ranks of each dimension.
 	cols: number of columns in each layer of the image,
@@ -63,12 +63,18 @@ gimp-brush-pipe-parameters" (IMAGE, PERSISTENT)
 		not necessarily are identical to the ranks of the
 		dimensions of a pipe, but in the case of two-
 		and three-dimensional pipes, it probably is.
-	rank0, rank1: (one for each dimension): the index range
+	rank0, rank1, ...: (one for each dimension): the index range
 		for that dimension
-	These are even more vague so far:
-	placement: "default", "constant", "random"
-	selection: "default", "random", "incremental", "angular",
-		"pressure", "velocity"
+	spacing: "default", "constant" or "random". "constant" means
+		 use the spacing in the first brush in the pipe.
+		 "random" means perturb that with some suitable
+		 random number function. (Hmm, would it be overdoing it
+		 if the pipe also could specify what random function
+		 and its parameters...?)
+	sel0, sel1, ...: "default", "random", "incremental", "angular",
+		"pressure", "velocity", and whatever else suitable we might
+		think of ;-) How one index from each dimension is
+		selected (until we have pinpointed the brush to use).
 
 "tiff-save-options" (IMAGE)
         The TiffSaveVals structure from the TIFF plugin.
diff --git a/plug-ins/common/psp.c b/plug-ins/common/psp.c
index 7d95584b02..c60682c886 100644
--- a/plug-ins/common/psp.c
+++ b/plug-ins/common/psp.c
@@ -1493,16 +1493,15 @@ read_tube_block (FILE *f,
     gimp_image_add_hguide (image_ID, (ia->height * i)/row_count);
 
   /* We use a parasite to pass in the tube (pipe) parameters in
-   * case we will have any use of those (for instance in some
-   * yet to be written code that saves a GIMP image pipe format
-   * file.
+   * case we will have any use of those, for instance in the gpb
+   * plug-in that saves a GIMP image pipe.
    */
   parasite_text =
     g_strdup_printf ("ncells:%d step:%d dim:%d cols:%d rows:%d "
-		     "rank0:%d rank1:%d "
-		     "placement:%s selection:%s",
+		     "rank0:%d "
+		     "spacing:%s sel0:%s",
 		     cell_count, step_size, 1, column_count, row_count,
-		     column_count, row_count,
+		     cell_count,
 		     (placement_mode == tpmRandom ? "random" :
 		      (placement_mode == tpmConstant ? "constant" :
 		       "default")),