diff --git a/pygmt/src/grdimage.py b/pygmt/src/grdimage.py
index a1ba783ab6c..e3158565c77 100644
--- a/pygmt/src/grdimage.py
+++ b/pygmt/src/grdimage.py
@@ -27,6 +27,7 @@
     N="no_clip",
     Q="nan_transparent",
     R="region",
+    T="no_interpolation",
     V="verbose",
     n="interpolation",
     c="panel",
@@ -132,6 +133,14 @@ def grdimage(self, grid, **kwargs):
         3). If the input is a grid, use **+z** to select another grid value
         than NaN. If input is instead an image, append an alternate *color* to
         select another pixel value to be transparent [Default is ``"black"``].
+    no_interpolation : bool or str
+        [**+o**\ [*pen*\ ]][**+s**].
+        Plot without any interpolation. This involves converting each node-
+        centered bin into a polygon which is then painted separately. Append **+s**
+        to skip nodes with z = NaN. This option is suitable for categorical data
+        where interpolating between values is meaningless and a categorical CPT
+        has been provided via ``cmap``. Append **+o** to draw the tile outlines,
+        and specify a custom pen.
     {region}
     {verbose}
     {panel}
diff --git a/pygmt/src/grdview.py b/pygmt/src/grdview.py
index 5e6256a0b1f..03a9d5c8c59 100644
--- a/pygmt/src/grdview.py
+++ b/pygmt/src/grdview.py
@@ -23,6 +23,7 @@
     Wm="meshpen",
     Wf="facadepen",
     I="shading",
+    T="no_interpolation",
     V="verbose",
     c="panel",
     f="coltypes",
@@ -103,6 +104,15 @@ def grdview(self, grid, **kwargs):
         specify azimuth, intensity, and ambient arguments for that function,
         or just give **+d** to select the default arguments
         [Default is **+a**\ -45\ **+nt**\ 1\ **+m**\ 0].
+    no_interpolation : bool or str
+        [**+o**\ [*pen*\ ]][**+s**].
+        Plot without any interpolation. This involves converting each node-
+        centered bin into a polygon which is then painted separately. Append **+s**
+        to skip nodes with z = NaN. This option is suitable for categorical data
+        where interpolating between values is meaningless and a categorical CPT
+        has been provided via ``cmap``. Append **+o** to draw the tile outlines,
+        and specify a custom pen. As this option produces a flat surface it cannot
+        be combined with ``zscale`` or ``zsize``.
     {verbose}
     {panel}
     {coltypes}