diff --git a/python/plugins/processing/algs/grass7/description/r.topidx.txt b/python/plugins/processing/algs/grass7/description/r.topidx.txt
index caff875ee41..154c994e72b 100644
--- a/python/plugins/processing/algs/grass7/description/r.topidx.txt
+++ b/python/plugins/processing/algs/grass7/description/r.topidx.txt
@@ -2,4 +2,4 @@ r.topidx
 Creates topographic index layer from elevation raster layer
 Raster (r.*)
 ParameterRaster|input|Input elevation layer|False
-OutputRaster|Topographic index
+OutputRaster|output|Topographic index
diff --git a/python/plugins/processing/algs/grass7/description/r.viewshed.txt b/python/plugins/processing/algs/grass7/description/r.viewshed.txt
index 55478e38dd5..8fd113767c9 100644
--- a/python/plugins/processing/algs/grass7/description/r.viewshed.txt
+++ b/python/plugins/processing/algs/grass7/description/r.viewshed.txt
@@ -2,9 +2,14 @@ r.viewshed
 Computes the viewshed of a point on an elevation raster map.
 Raster (r.*)
 ParameterRaster|input|Elevation|False
-ParameterString|coordinates|Coordinate identifying the viewing position|0,0
-ParameterString|observer_elevation|Viewing position height above the ground|1.75
-ParameterString|target_elevation|Offset for target elevation above the ground|0.0
-ParameterString|max_distance|Maximum distance from the viewing point (meters)|10000
-ParameterBoolean|-c|Consider earth curvature (current ellipsoid)|False
+ParameterString|coordinates|Coordinate identifying the viewing position|0,0|False|False
+ParameterString|observer_elevation|Viewing elevation above the ground|1.75|False|False
+ParameterString|target_elevation|Offset for target elevation above the ground|0.0|False|False
+ParameterString|max_distance|Maximum distance from the viewing point (meters)|-1|False|False
+ParameterNumber|refraction_coeff|Refraction coefficient|0.0|1.0|0.14286|False
+ParameterNumber|memory|Amount of memory to use in MB|1|None|500|False
+*ParameterBoolean|-c|Consider earth curvature (current ellipsoid)|False
+*ParameterBoolean|-r|Consider the effect of atmospheric refraction|False
+*ParameterBoolean|-b|Output format is invisible = 0, visible = 1|False
+*ParameterBoolean|-e|Output format is invisible = NULL, else current elev - viewpoint_elev|False
 OutputRaster|output|Intervisibility
diff --git a/python/plugins/processing/algs/grass7/description/r.volume.txt b/python/plugins/processing/algs/grass7/description/r.volume.txt
index e8fa9de76e3..855ac8034cf 100644
--- a/python/plugins/processing/algs/grass7/description/r.volume.txt
+++ b/python/plugins/processing/algs/grass7/description/r.volume.txt
@@ -1,7 +1,7 @@
 r.volume
 Calculates the volume of data "clumps".
 Raster (r.*)
-ParameterRaster|data|Layer representing data that will be summed within clumps|False
+ParameterRaster|input|Name of input raster map representing data that will be summed within clumps|False
 ParameterRaster|clump|Clumps layer (preferably the output of r.clump)|False
 *ParameterBoolean|-f|Generate unformatted report|False
 OutputVector|centroids|Centroids