diff --git a/base_classes/NXdata.nxdl.xml b/base_classes/NXdata.nxdl.xml
index 1032efb44..78b82e556 100644
--- a/base_classes/NXdata.nxdl.xml
+++ b/base_classes/NXdata.nxdl.xml
@@ -120,7 +120,7 @@
 			Which slice of data to show in a plot by default. This is useful especially for
 			datasets with more than 2 dimensions.
 
-			Should be an array of strings of length equal to the number of dimesions
+			Should be an array of strings of length equal to the number of dimensions
 			in the data, with the following possible values:
 
 			* ".": All the data in this dimension should be included