diff --git a/README.md b/README.md
index 352d86e..4f9f056 100644
--- a/README.md
+++ b/README.md
@@ -79,4 +79,4 @@ latter fetches all records. Both return a tuple of `class_` objects.
 
 The last helper method, `fetch_if(class_, condition)` fetches all
 the records of type `class_` that fit a certain condition. Here conditions
-must be written is SQL syntax.
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+must be written is SQL syntax. Be careful about the string espacially.
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