diff --git a/imagery/i.segment/i.segment.html b/imagery/i.segment/i.segment.html
index 1e2596c1d7e..e30f21d3743 100644
--- a/imagery/i.segment/i.segment.html
+++ b/imagery/i.segment/i.segment.html
@@ -118,7 +118,7 @@ <h3>Mean shift</h3>
 <h3>Boundary Constraints</h3>
 Boundary constraints limit the adjacency of pixels and segments.
 Each unique value present in the <b>bounds</b> raster are
-considered as a MASK. Thus no segments in the final segmentated map
+considered as a mask. Thus, no segments in the final segmented map
 will cross a boundary, even if their spectral data is very similar.
 
 <h3>Minimum Segment Size</h3>
diff --git a/imagery/i.segment/iseg.h b/imagery/i.segment/iseg.h
index 1e301d2cefa..a8dfb5542c3 100644
--- a/imagery/i.segment/iseg.h
+++ b/imagery/i.segment/iseg.h
@@ -118,7 +118,7 @@ struct globals {
 
     /* processing flags */
     FLAG *candidate_flag,
-        *null_flag; /*TODO, need some way to remember MASK/NULL values.  Was
+        *null_flag; /*TODO, need some way to remember mask/NULL values.  Was
                        using -1, 0, 1 in int array.  Better to use 2 FLAG
                        structures, better readability? */
 
diff --git a/ps/ps.map/r_instructions.c b/ps/ps.map/r_instructions.c
index 0e2c012fd92..87a2e4bbfcf 100644
--- a/ps/ps.map/r_instructions.c
+++ b/ps/ps.map/r_instructions.c
@@ -29,7 +29,7 @@ static char *help[] = {
     "read       unix-file             eps        Encapsulated PostScript file",
     "border     [y|n]                 mapinfo    map information",
     "window     region definition     region     region definition",
-    "maskcolor  MASK color",
+    "maskcolor  mask color",
     "rectangle  east north east north",
     "scale      1:#|# inches|# panels|1 inch = # miles",
     "outline    map composition outline",
diff --git a/raster/r.resamp.interp/r.resamp.interp.html b/raster/r.resamp.interp/r.resamp.interp.html
index e4b77ac0d34..3c3eecc68a9 100644
--- a/raster/r.resamp.interp/r.resamp.interp.html
+++ b/raster/r.resamp.interp/r.resamp.interp.html
@@ -28,7 +28,7 @@ <h2>NOTES</h2>
 <p>Note that for bilinear, bicubic and lanczos interpolation,
 cells of the output raster that cannot be bounded by the appropriate number
 of input cell centers are set to NULL (NULL propagation). This could occur
-due to the input cells being outside the current region, being NULL or MASKed.
+due to the input cells being outside the current region, being NULL or masked.
 
 
 <p>For longitude-latitude coordinate reference systems,
diff --git a/raster/r.topidx/r.topidx.html b/raster/r.topidx/r.topidx.html
index 56dd001f20a..75938e6a231 100644
--- a/raster/r.topidx/r.topidx.html
+++ b/raster/r.topidx/r.topidx.html
@@ -10,12 +10,14 @@ <h2>DESCRIPTION</h2>
   <dd>the local surface topographic slope (delta vertical) / (delta
       horizontal).</dd>
 </dl>
-<p>Input maps may have NULL values.  For example, if you have a MASK for a
-watershed (basin map from <em>r.water.outlet</em>), the following command will
-create a masked elevation map (belev):
+<p>Input maps may have NULL values. For example, if you have a raster mask set
+for a watershed (using basin map from <em>r.water.outlet</em>), the following
+command will create a masked elevation map (belev):
+
 <div class="code"><pre>
 r.mapcalc "belev = if(isnull(basin), basin, elev)"
 </pre></div>
+
 <p>
 <em>r.stats -Anc</em> prints out averaged statistics for topographic index.