diff --git a/content/books/things-i-learnt/_index.md b/content/books/things-i-learnt/_index.md
index c6cd3b9..6013d97 100644
--- a/content/books/things-i-learnt/_index.md
+++ b/content/books/things-i-learnt/_index.md
@@ -54,6 +54,7 @@ template = "section-contentless.html"
 		* [The Config File Is Friend](config-file)
 		* [Command Line Options Are Weird, But Helpful](command-line-options)
 		* [Not Just Function Composition, But Application Composition](application-composition)
+		* [Even for Application Composition, Start Stupid](app-composition-stupid)
 		* [Logs Are For Events, Not User Interface](log-events)
 		* [Learn To Monitor](monitoring)
 * Community/Teams
diff --git a/content/books/things-i-learnt/app-composition-stupid/index.md b/content/books/things-i-learnt/app-composition-stupid/index.md
new file mode 100644
index 0000000..e7edb4e
--- /dev/null
+++ b/content/books/things-i-learnt/app-composition-stupid/index.md
@@ -0,0 +1,30 @@
++++
+title = "Things I Learnt The Hard Way - Even for Application Composition, Start Stupid"
+date = 2019-07-15
+
+[taxonomies]
+tags = ["en-au", "books", "things i learnt", "composition", "microservices"]
++++
+
+Application composition may lead to microservices -- which is good -- but
+microservices require some ideas about how applications "talk" between them
+over the wire (protocols and such) which you don't need to start with.
+
+<!-- more -->
+
+Again, because you just want to simplify your work, you can make the
+applications use files directly: Have your first application generate two
+files and the second application receive the file names from [the command
+line](/books/things-i-learnt/command-line-options). There, simple and stupid,
+and works.
+
+You can even make the first application, instead of generating a file, just
+send its result on the standard output, and have the second application
+receive the data from the standard input -- both of which are managed as
+files, anyway. Then, with a bit of magic, you can put everything together
+without wasting space.
+
+Worry about talking over the wire later, when you understand how networks
+work.
+
+{{ chapters(prev_chapter_link="/books/things-i-learnt/application-composition", prev_chapter_title="Not Just Function Composition, But Application Composition", next_chapter_link="/books/things-i-learnt/log-events", next_chapter_title="Logs Are For Events, Not User Interface") }}
diff --git a/content/books/things-i-learnt/application-composition/index.md b/content/books/things-i-learnt/application-composition/index.md
index c9ff1ca..5741b65 100644
--- a/content/books/things-i-learnt/application-composition/index.md
+++ b/content/books/things-i-learnt/application-composition/index.md
@@ -41,4 +41,4 @@ applications (why would you ask your user to have _two_ applications open at
 the same time to make something work?) but you can extrapolate this for almost
 everything else.
 
-{{ chapters(prev_chapter_link="/books/things-i-learnt/command-line-options", prev_chapter_title="Command Line Options Are Weird, But Helpful", next_chapter_link="/books/things-i-learnt/log-events", next_chapter_title="Logs Are For Events, Not User Interface") }}
+{{ chapters(prev_chapter_link="/books/things-i-learnt/command-line-options", prev_chapter_title="Command Line Options Are Weird, But Helpful", next_chapter_link="/books/things-i-learnt/app-composition-stupid", next_chapter_title="Even for Application Composition, Start Stupid") }}
diff --git a/content/books/things-i-learnt/log-events/index.md b/content/books/things-i-learnt/log-events/index.md
index db45937..ec8349a 100644
--- a/content/books/things-i-learnt/log-events/index.md
+++ b/content/books/things-i-learnt/log-events/index.md
@@ -43,4 +43,4 @@ could have the values to try to figure out why it failed -- surely, logging
 why it failed also helps, but you know what I mean. This is an example of
 something that makes complete sense in logs, but not in user interfaces.
 
-{{ chapters(prev_chapter_link="/books/things-i-learnt/application-composition", prev_chapter_title="Not Just Function Composition, But Application Composition", next_chapter_link="/books/things-i-learnt/monitoring", next_chapter_title=Learn To Monitor"") }}
+{{ chapters(prev_chapter_link="/books/things-i-learnt/app-composition-stupid", prev_chapter_title="Even for Application Composition, Start Stupid", next_chapter_link="/books/things-i-learnt/monitoring", next_chapter_title=Learn To Monitor"") }}