diff --git a/doc/bugs/Missing_backend_extension_in_files_with_long_extensions.mdwn b/doc/bugs/Missing_backend_extension_in_files_with_long_extensions.mdwn
index 4f937d14e7..d554a390a7 100644
--- a/doc/bugs/Missing_backend_extension_in_files_with_long_extensions.mdwn
+++ b/doc/bugs/Missing_backend_extension_in_files_with_long_extensions.mdwn
@@ -40,3 +40,5 @@ macOS isn't able to open a file without extension. In order to just view it, I h
 ### Have you had any luck using git-annex before? (Sometimes we get tired of reading bug reports all day and a lil' positive end note does wonders)
 
 Yup, I've been using it for 5 years. It's awesome! Thank you.
+
+> [[done]] --[[Joey]]
diff --git a/doc/bugs/Missing_backend_extension_in_files_with_long_extensions/comment_1_69f8ce0c55af2667b2977d19b173fb83._comment b/doc/bugs/Missing_backend_extension_in_files_with_long_extensions/comment_1_69f8ce0c55af2667b2977d19b173fb83._comment
new file mode 100644
index 0000000000..7ce0d1687d
--- /dev/null
+++ b/doc/bugs/Missing_backend_extension_in_files_with_long_extensions/comment_1_69f8ce0c55af2667b2977d19b173fb83._comment
@@ -0,0 +1,18 @@
+[[!comment format=mdwn
+ username="joey"
+ subject="""comment 1"""
+ date="2018-10-04T19:30:23Z"
+ content="""
+The problem is that "foo.numbers" may appear to have an extension to you,
+but "foo.doesnothaveanextension" appears to me to not have an extension.
+
+(And I doubt I'd consider ".numbers" to be an extension either because it's
+much longer than any usual extension and looks like like an english word.
+"I.like.numbers" does not have an extension IMHO.)
+
+So, git-annex has to somehow guess, and it does this by assuming that all
+common filename extensions are less than 4 letters (not including the dot).
+
+The annex.maxextensionlength setting was recently added which lets you tune
+this.
+"""]]