+For eample, if this readme was a file in the gemini content directory
+and had its execute bits set, the following would insert the current
+time into the document when it was served:
+,(eval
+ (begin
+ (import (chicken time posix))
+ (print "The time is " (seconds->string))))
+
+(This applies to all executable text/* documents, regardless of the
+specific content type.)
+
+Similarly, shell script output can be incorporated:
+,(shell "uptime")
+