diff --git a/SC2157.md b/SC2157.md
index 506c157..95ba391 100644
--- a/SC2157.md
+++ b/SC2157.md
@@ -16,7 +16,7 @@
 
 ### Rationale:
 
-Since `[ str ]` checks that the string is non-empty, the space inside the quotes in the problematic code causes the test to always be true. 
+Since `[ str ]` checks that the string is non-empty, the space inside the quotes in the problematic code causes the test to always be true, since a string with a space can not be empty.
 
 Sometimes this is also caused by overquoting an example, e.g. `[ "$foo -gt 0" ]`, which is always true for the same reason. The intention here was `[ "$foo" -gt 0 ]`.