diff --git a/docs/LangRef.rst b/docs/LangRef.rst
index 18d2c9c..810455c 100644
--- a/docs/LangRef.rst
+++ b/docs/LangRef.rst
@@ -128,7 +128,9 @@
 #. Unnamed temporaries are created when the result of a computation is
    not assigned to a named value.
 #. Unnamed temporaries are numbered sequentially (using a per-function
-   incrementing counter, starting with 0).
+   incrementing counter, starting with 0). Note that basic blocks are
+   included in this numbering. For example, if the entry basic block is not
+   given a label name, then it will get number 0.
 
 It also shows a convention that we follow in this document. When
 demonstrating instructions, we will follow an instruction with a comment