diff --git a/README.md b/README.md
index c2c6a8244..f55c15883 100644
--- a/README.md
+++ b/README.md
@@ -348,7 +348,7 @@ of:
 FUTURE,STDLIB,THIRDPARTY,FIRSTPARTY,LOCALFOLDER
 ```
 
-to your preference:
+to your preference (if defined, omitting a default section may cause errors):
 
 ```ini
 sections=FUTURE,STDLIB,FIRSTPARTY,THIRDPARTY,LOCALFOLDER
diff --git a/docs/configuration/options.md b/docs/configuration/options.md
index bf2205243..de70eda48 100644
--- a/docs/configuration/options.md
+++ b/docs/configuration/options.md
@@ -108,7 +108,9 @@ Forces line endings to the specified value. If not set, values will be guessed p
 
 ## Sections
 
-**No Description**
+Specifies a custom ordering for sections. Any custom defined sections should also be
+included in this ordering. Omitting any of the default sections from this tuple may
+result in unexpected sorting or an exception being raised.
 
 **Type:** Tuple  
 **Default:** `('FUTURE', 'STDLIB', 'THIRDPARTY', 'FIRSTPARTY', 'LOCALFOLDER')`