diff --git a/doc/Section_howto.html b/doc/Section_howto.html
index 906b1297fa..29460afe22 100644
--- a/doc/Section_howto.html
+++ b/doc/Section_howto.html
@@ -900,7 +900,9 @@ compute or fix must generate global scalar or vector quantities.  The
 time-averaged values generated by <A HREF = "fix_ave_time.html">fix ave/time</A> can
 be written directly to a file and/or accessed by any output command
 that uses fixes as a source of input, e.g. the <A HREF = "thermo_style.html">thermo_style
-custom</A> command.
+custom</A> command.  Fix ave/time options allow for
+running cummulative averages or moving time-windowed averages to be
+output.
 </P>
 <P>The <A HREF = "fix_ave_spatial.html">fix ave/spatial</A> command enables
 spatial-averaging of per-atom quantities like per-atom energy or
@@ -913,7 +915,9 @@ average of a spatial average of a time-averaged per-atom quantity.
 The time-averaged values generated by <A HREF = "fix_ave_spatial.html">fix
 ave/spatial</A> can be written directly to a file
 and/or accessed by any output command that uses fixes as a source of
-input, e.g. the <A HREF = "thermo_style.html">thermo_style custom</A> command.
+input, e.g. the <A HREF = "thermo_style.html">thermo_style custom</A> command.  Fix
+ave/spatial options allow for running cummulative averages or moving
+time-windowed averages to be output.
 </P>
 <P>The <A HREF = "fix_print.html">fix print</A> command can generate a line of output
 written to the screen and log file periodically during a running
diff --git a/doc/Section_howto.txt b/doc/Section_howto.txt
index 26d34ecb9c..26c6d4ee2a 100644
--- a/doc/Section_howto.txt
+++ b/doc/Section_howto.txt
@@ -893,7 +893,9 @@ compute or fix must generate global scalar or vector quantities.  The
 time-averaged values generated by "fix ave/time"_fix_ave_time.html can
 be written directly to a file and/or accessed by any output command
 that uses fixes as a source of input, e.g. the "thermo_style
-custom"_thermo_style.html command.
+custom"_thermo_style.html command.  Fix ave/time options allow for
+running cummulative averages or moving time-windowed averages to be
+output.
 
 The "fix ave/spatial"_fix_ave_spatial.html command enables
 spatial-averaging of per-atom quantities like per-atom energy or
@@ -906,7 +908,9 @@ average of a spatial average of a time-averaged per-atom quantity.
 The time-averaged values generated by "fix
 ave/spatial"_fix_ave_spatial.html can be written directly to a file
 and/or accessed by any output command that uses fixes as a source of
-input, e.g. the "thermo_style custom"_thermo_style.html command.
+input, e.g. the "thermo_style custom"_thermo_style.html command.  Fix
+ave/spatial options allow for running cummulative averages or moving
+time-windowed averages to be output.
 
 The "fix print"_fix_print.html command can generate a line of output
 written to the screen and log file periodically during a running