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-rw-r--r--docs/source/projections/geos.rst2
1 files changed, 1 insertions, 1 deletions
diff --git a/docs/source/projections/geos.rst b/docs/source/projections/geos.rst
index 2e309241..56550159 100644
--- a/docs/source/projections/geos.rst
+++ b/docs/source/projections/geos.rst
@@ -66,7 +66,7 @@ This example represents the scanning geometry of the Meteosat series satellite.
However, the GOES satellite series use the opposite scanning geometry, with the
E/W axis (``x``) as the sweep-angle axis, and the N/S (``y``) as the fixed-angle axis.
-The sweep argument is used to tell proj.4 which on which axis the outer-gimbal
+The sweep argument is used to tell PROJ.4 which on which axis the outer-gimbal
is rotating. The possible values are x or y, y being the default. Thus, the
scanning geometry of the Meteosat series satellite should take sweep as x, and
GOES should take sweep as y.