GenericMappingTools · willschlitzer · Sep 30, 2021 · Sep 10, 2021 · Sep 11, 2021 · Sep 23, 2021
diff --git a/doc/api/index.rst b/doc/api/index.rst
@@ -81,6 +81,7 @@ Operations on tabular data:
 
     blockmean
     blockmedian
+    sphdistance
     surface
 
 Operations on grids:
@@ -97,7 +98,6 @@ Operations on grids:
     grdproject
     grdsample
     grdtrack
-    sphdistance
     xyz2grd
 
 Crossover analysis with x2sys:

diff --git a/pygmt/src/sphdistance.py b/pygmt/src/sphdistance.py
@@ -35,6 +35,10 @@ def sphdistance(table, **kwargs):
 
     Parameters
     ----------
+    table : str or {table-like}
+        Pass in (x, y, z) or (longitude, latitude, elevation) values by
+        providing a file name to an ASCII data table, a 2D
+        {table-classes}.
     outgrid : str or None
         The name of the output netCDF file with extension .nc to store the grid
         in.