diff --git a/doc/datamash.texi b/doc/datamash.texi
index 843362c..a7cd03e 100644
--- a/doc/datamash.texi
+++ b/doc/datamash.texi
@@ -589,7 +589,7 @@ Social-Sciences  27      90
 @end example
 
 @cindex mean, examples
-@cindex standard devian, examples
+@cindex standard deviation, examples
 @cindex examples, mean
 @cindex examples, standard deviation
 find the mean and (population) standard deviation in each subject:
diff --git a/man/datamash.x b/man/datamash.x
index 552d9f4..8c191dd 100644
--- a/man/datamash.x
+++ b/man/datamash.x
@@ -349,7 +349,7 @@ Caleb          Business         87
 Christian      Business         88
 Derek          Arts             60
 
-# Calculate the mean and standard devian for each major
+# Calculate the mean and standard deviation for each major
 $ \fBdatamash\fR \-\-sort \-\-headers \-\-group 2 mean 3 pstdev 3 < scores_h.txt
 
  (or use short form)